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Longman Dictionary of Contemporary English
equatorial
adjective
EXAMPLES FROM OTHER ENTRIES
▪ an equatorial rainforest
EXAMPLES FROM CORPUS
▪ But if the principal base of lunar operations is in the equatorial region, the attractiveness of polar ice is greatly diminished.
▪ But not too hot - not equatorial or anything.
▪ Early on, studies of the equatorial regions revealed great volcanic mountain systems and several apparent large impact craters.
▪ For some reason, this compression was more efficient along an equatorial belt, making a ring-like structure.
▪ It is not easy to get the water from the polar regions to the equatorial base, where it is needed.
▪ More recently, in an age of man-made satellites, the polar stereoscopic projection and the equatorial stereoscopic projection have become important.
▪ Of course an infinite number of equatorial orbits exist, but only one geostationary orbit.
▪ The equatorial diameter exceeds the polar diameter by 26 miles.
The Collaborative International Dictionary
Equatorial

Equatorial \E`qua*to"ri*al\, a. [Cf. F. ['e]quatorial.] Of or pertaining to the equator; as, equatorial climates; also, pertaining to an equatorial instrument.

Equatorial

Equatorial \E`qua*to"ri*al\, n. (Astron.) An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known. The motion in right ascension is sometimes communicated by clockwork, so as to keep the object constantly in the field of the telescope. Called also an equatorial telescope.

Note: The term equatorial, or equatorial instrument, is sometimes applied to any astronomical instrument which has its principal axis of rotation parallel to the axis of the earth.

Douglas Harper's Etymology Dictionary
equatorial

1660s, from equator + -ial. Related: Equatorially.

Wiktionary
equatorial

a. of, near, or relating to the equator n. (context astronomy English) A kind of telescope mounted so as to have two axis of motion at right angles to each other, one of them parallel to the axis of the Earth, and each carrying a graduated circle, one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known.

WordNet
equatorial
  1. adj. of or relating to or at an equator; "equatorial diameter"

  2. of or relating to conditions at the geographical equator; "equatorial heat"

  3. of or existing at or near the geographic equator; "equatorial Africa" [ant: polar]

Wikipedia
Equatorial

Equatorial generally means "of or related to an equator".

Equatorial may refer specifically to:

Places:

  • Equatorial region, a region of the Earth surrounding the equator
  • Equatorial Africa
  • Equatorial Guinea, a country in Central Africa

In astronomy:

  • Equatorial plane, a plane in the celestial sphere defined by the Earth's equator
  • Equatorial coordinate system, a celestial coordinate system defined by the Earth's equatorial plane
  • Equatorial orbit, a gravitational orbit in the equatorial plane

In other sciences:

  • Equatorial bond, a chemical bond positioned nearly parallel to the mean plane of a ring-structured molecule
  • Equatorial climate, in climatology and meteorology

Usage examples of "equatorial".

There was so much of her, such incredibly long legs, such an extreme flow of line and volume, Beheim became entranced by the exaggerated perspectives available, gazing up at the equatorial swell of her belly toward the flattened mounds of her breasts with their dark oases of areola and turreted nipples, or down from her breasts toward the unruly pubic tuft between her thighs, in all reminding him by its smoothness of the sand sculpture of a sleeping giantess he had seen years before on a beach in Spain.

Iryala, but as virtually the entire human population of recent millennia lives in the equatorial zone, axial tilt does not directly impact the lives of Terfreyans.

But its people -- mostly Suni Muslim engineers from the failed Trans-African Genetic Reclamation Project -- stubbornly refused to die during the Fall, and ended up terraforming Groombridge Dyson D into a Laplandic tundra world with breathable air and adapted-Old Earth flora and fauna, including wooly mammoths wandering the equatorial highlands.

The cavitation of the Moon was to be induced by eighteen missiles that would travel from a distant circle toward its equatorial surface along trajectories of the involute type.

Without spin, its event horizon expanded, filling up the equatorial belt where the ergosphere had been.

Snider Key West Hugh McKinley and mother Cyprus Max Kenyerezi French Equatorial Africa Elsa Grossmann Frisian Islands Helen Robinson Baranof Mr Mrs Ted Anderson Yukon Tabandeh Payman San-Marino Una Townshend Malta Rolf Haug Crete swelling roll honour raising number territories pale Faith hundred sixty seven.

Antarctica was moving north, dragging the whole crust of the planet with it to the accompaniment of quakes and typhoons and rivers of lava, forcing new mountains up where the skin was compressed as areas moved poleward, opening vast new chasms where the lithosphere was stretched to span the increasing planetary circumference of equatorial regions.

Saturn was suspected to be that of a square figure, with the corners rounded off, so as to leave both the equatorial and polar zones flatter than pertained to a true spheroidal figure.

The thalassic peoples here in the Equatorial Zone are fairly good empirical, teaspoon-measure, chemists.

The North Zirks have ridden all the way around it, on hipposaur-back, in the high latitudes, and the thalassic peoples at the Equator have sailed all the five equatorial seas and portaged all the isthmuses between.

The general serenity of equatorial regions is due to the fact that they are beyond the limit of the vortices, as in Peru, where neither rain nor lightning nor storm is ever seen.

But on a mid-Atlantic swell, with the bowsprit punching into the run of the Equatorial current, it was hard to take decent aim.

There will be an equatorial brightening of the sun, essentially, an outflux of energy that will bathe the orbital plane of Earth, and the other planets.

And at night, under the equatorial overgrowth and heat-holding cloud cover, you hear the ragged parrot-hoot and monkeysqueak of the sirens, and then fires flower to ward off monsters.

Livingstone first, and after him, Grant, Speke, Burton, Cameron, Stanley, are the heroes whose names will ever be linked with the first dawnings of a brighter age upon the dark wilds of Equatorial Africa.