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Longman Dictionary of Contemporary English
▪ As these boxes had a small square opening at the back, glazed with opal glass, the Oyster lamps were removed.
▪ Coober Pedy has produced 80 percent of the world's opals since 1915.
▪ Faint dark mist was the background, with the symbols only crude and faded opal scars.
▪ It was raven black and the hair was entwined with a slim rope of gold thread and opals.
▪ The 2000 collection of spring colours are a combination of warm topaz and cool opal.
▪ The only windows in the building were narrow and high, and they washed the enclosed space in an opal gloom.
▪ This is most apparent in the precious opal which is capable of displaying a veritable kaleidoscope of colours.
▪ Upper House came out of its concrete grudgingly, like an opal from the matrix.
The Collaborative International Dictionary

Opal \O"pal\, n. [L. opalus: cf. Gr. ?, Skr. upala a rock, stone, precious stone: cf. F. opale.] (Min.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.

Note: The precious opal presents a peculiar play of colors of delicate tints, and is highly esteemed as a gem. One kind, with a varied play of color in a reddish ground, is called the harlequin opal. The fire opal has colors like the red and yellow of flame. Common opal has a milky appearance. Menilite is a brown impure variety, occurring in concretions at Menilmontant, near Paris. Other varieties are cacholong, girasol, hyalite, and geyserite.

Douglas Harper's Etymology Dictionary

1590s, from Middle French opalle (16c.), from Latin opalus (Pliny), supposedly from Greek opallios, possibly ultimately from Sanskrit upala-s "gem, precious stone." Used in Middle English in Latin form (late 14c.).


n. (context mineralogy English) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula siliconoxygen2'''·'''nwater.


n. a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones

Opal, WY -- U.S. town in Wyoming
Population (2000): 102
Housing Units (2000): 48
Land area (2000): 0.430749 sq. miles (1.115636 sq. km)
Water area (2000): 0.000000 sq. miles (0.000000 sq. km)
Total area (2000): 0.430749 sq. miles (1.115636 sq. km)
FIPS code: 57810
Located within: Wyoming (WY), FIPS 56
Location: 41.770449 N, 110.325918 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Opal, WY

Opal is a hydrated amorphous form of silica (SiO·nHO); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Opal is the national gemstone of Australia.

The internal structure of precious opal makes it diffract light; depending on the conditions in which it formed, it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the black opals are the most rare, whereas white and greens are the most common. It varies in optical density from opaque to semitransparent.

Opal (programming language)

OPAL (OPtimized Applicative Language) is a functional programming language first developed at the Technical University of Berlin.

Opal (fuel)

Opal is a variety of low-aromatic 91 RON petrol developed in 2005 by BP Australia to combat the rising use of petrol as an inhalant in remote Indigenous Australian communities.

Though more expensive to produce, requiring a $0.33/litre Federal subsidy, a 2006 report found it would likely save at least $27 million per year when the social and health costs of petrol-sniffing were taken into account.

A 2010 senate report showed that the introduction of Opal in 106 communities across remote and regional Australia had led to a 70% drop in petrol sniffing in those communities.

Typical unleaded petrol contains 25% aromatics, such as toluene, ortho-xylene and para-xylene. In contrast, Opal contains only 5% aromatics, which means that it has less of the toluene and other solvents which produce the intoxication (or "high") that inhalant users are seeking. The Australian Government subsidizes Opal's provision and restricts traditional unleaded petrol in some remote communities. According to BP, the lower volatile component in Opal means that cars using it are less prone to vapor lock.

Prior to the introduction of Opal, Comgas (a brand of the aviation fuel avgas) has been used in many communities to discourage use of fuel as an inhalant. Unlike Opal, however, Comgas contains tetraethyllead (TEL), a substance that is poisonous and is banned throughout most of the world for automobile use after the discovery that it was creating an increase in lead particles over the entire earth, including the poles.

Opal (disambiguation)

An opal is a gemstone.

Opal may also refer to:

Opal (armoured personnel carrier)

The Opal-I is a multi-purpose fully amphibious armoured personnel carrier developed and produced by HSW S.A.. APC is a development of MT-LB that was produced in HSW on licence. Major changes are with reworked nose section and propellers for better in water speed and manoeuvrability, new turret with 12.7 mm NSVT machine-gun instead of old with 7.62 PKT and powered-up engine. Opal-II is a stretched variant with longer chassis with 7 road wheels on each side, like the 2S1 and MT-LBu and 300 hp (220 kW) SW680T engine.

OPAL (software)

The Open Physics Abstraction Layer (OPAL) is an open source realtime physics engine API similar to PAL. It is currently supported only by ODE, but can be extended to run off of other engines. OPAL is free software, released under both the LGPL and the BSD license. It was originally designed and written by Tyler Streeter, Andres Reinot, and Alan Fischer while working at Iowa State University's Virtual Reality Applications Center (VRAC).

OPAL is a high-level interface for low-level physics engines used in games, robotics simulations, and other 3D applications. Features a simple C++ API, intuitive objects (e.g. Solids, Joints, Motors, Sensors), and XML-based file storage for complex objects.

The latest version of OPAL is 0.4.0. On June 23, 2010, OPAL development officially ended.

Opal (band)

Opal were an American rock band in the 1980s. They were part of the Paisley Underground musical style.

The group formed in the mid-'80s under the name Clay Allison, featuring guitarist David Roback (previously of Rain Parade), bassist Kendra Smith (from Dream Syndicate) and drummer Keith Mitchell. After one single, they released the remaining Clay Allison tracks under the band's new name, Opal, on the 1984 Fell from the Sun EP. Another EP, Northern Line, followed in 1985. These EPs were later compiled and released as Early Recordings

Happy Nightmare Baby, Opal's first full-length album, was released in 1987. Smith left the group during the Happy Nightmare tour after a show in Providence, Rhode Island. Roback continued with vocalist Hope Sandoval, playing shows as Opal and planning an album to be titled Ghost Highway but in 1989 this band became Mazzy Star and Ghost Highway was presumably released as She Hangs Brightly. Kendra Smith released a number of solo singles, EPs, and one album before retiring to the woods of northern California.

The song "She's a Diamond" was included in the film Boys Don't Cry but was not included on the CD release of the film soundtrack.

Opal (given name)

Opal is a feminine given name derived from the name of the gemstone opal. The gemstone is the birthstone for October. Its name is derived from the Sanskrit उपल or upala, which means "jewel". It came into use along with other gemstone names during the late Victorian era.

Opal was among the 100 most popular names for girls born in the United States from 1900 to 1920 and remained among the top 500 most popular names for girls there until 1950. It was last ranked among the 1,000 most popular names for girls in the United States in the 1950s. It was the 344th most common name for females in the United States in the 1990 census. Eighty girls born in the United States in 2010 were given the name and 92 girls born in 2011 were given the name.

Opal (apple)

Opal® is the brand name for a cultivar of apple also known as 'UEB32642', produced by crossing ' Golden Delicious' with 'Topaz'. Developed by the Institute of Experimental Botany in Prague and FruitSelect in 1999, it is grown by Broetje Orchards in Washington and marketed by the First Fruits company. It is also cultivated in Austria, the Netherlands and France. Opal is a variety registered with the Community Plant Variety Office of the European Union.

Usage examples of "opal".

A huge ammonite rose, its body concealed within a curled shell with all the shimmering colors of a fire opal.

Turquoise were the most numerous, but other stones included rose quartz, red jasper, leopard jasper, amethyst, lapis lazuli, opal, bloodstone, tiger-eye, azurite, malachite, and more beyond reckoning.

He rubbed the engraved opal that was the bezel of the ring and it began to glow like a brightening ember, smoky crimson shot with livid green at first, then kindling to a vivid scarlet.

Ganmiddich roundhouse with a troop of only two hundred swordsmen, Cluff Drybannock had taken to braiding his waist-length hair with rings of opal.

Lamps that were milky opals self-effulgent filled all the chamber with a soft radiance, in which the bas-reliefs of the high dado, delicately carved, portraying those immortal blooms of amaranth and nepenthe and moly and Elysian asphodel, were seen in all their delicate beauty, and the fair painted pictures of the Lord of Krothering and his lady sister, and of Lord Juss above the great open fireplace with Goldry and Spitfire on his left and right.

Ruby was certain that Florian was lost in one of the labyrinths at Maastricht or Valkenburg, Opal stated the opinion that he had gone to the Dolomites and was not lost at all.

But we were bound to walk, so we went on, whilst above our heads waved medusae whose umbrellas of opal or rose-pink, escalloped with a band of blue, sheltered us from the rays of the sun and fiery pelagiae, which, in the darkness, would have strewn our path with phosphorescent light.

Duke Gadman, Lord Rolfston Red-briar and Lady Melina Shield, with Sapphire, Jet, Opal, Ruby, and Citrine Shield.

Duke Gadman, Lord Rolfston Redbriar and Lady Melina Shield, with Sapphire, Jet, Opal, Ruby, and Citrine Shield.

In the ring was set an enormous girasol - a rare type of fire opal which had no counterpart in the world.

A glimmering gem - a rare fire opal called a girasol - appeared upon a finger of the left hand.

These were the chief among the six rivals of Sarchimus the Wise, and of them all, it was Hoom of the Opal Spire who was the most dangerous and the most to be feared.

Bardo had brought back with him riches and many, many things, the pelf of a hundred worlds: gosharps and sihu oil, furniture, bonsai plants, sacred jewellery from Vesper, blacking oil, tondos, paintings and Darghinni sculpture, many kinds of sense boxes including dreammakers and other exotic toys, and Yarkona diamonds, and Darkmoon rubies, emeralds, opals, firestones, and pearls from the ocean floors of New Earth, Fravashi carpets, of course, and drugs such as jook, jambool, toalache, beer and skotch.

He was the more impressive because in the midst of wealth and splendour he remained poor: he had more than once bought turquoises and opals and horses and saddlery, which he paid for in instalments, like any little merchant.

They knew the secret spot where one must stand-- They knew the surest hour, the proper slant of sun-- To gather in, unmarred, undimmed, The vision of the fane in all its fairy grace, A fainting dream against the opal sky.