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Longman Dictionary of Contemporary English
rhomboid
noun
EXAMPLES FROM CORPUS
▪ For a leader to develop the necessary competencies, he must start to think about rhomboids.
▪ Modern architects are moving away from the divinity of the right angle to rhomboids, to rounded spaces and parabolas.
▪ These latter exercises also work the lower trapezius muscles and the rhomboids.
The Collaborative International Dictionary
Rhomboid

Rhomboid \Rhom"boid\ (r[o^]m"boid), a. Same as Rhomboidal.

Rhomboid

Rhomboid \Rhom"boid\ (r[o^]m"boid), n. [Gr. ??? rhomboidal; ??? rhomb + e'i^dos shape: cf. F. rhombo["i]de.] (Geom.) An oblique-angled parallelogram like a rhomb, but having only the opposite sides equal, the length and with being different.

Douglas Harper's Etymology Dictionary
rhomboid

1560s, from Middle French rhomboide or directly from Late Latin rhomboides, from Greek rhomboeides "rhomboidal; a rhomboid;" see rhombus + -oid. Related: Rhomboidal. As an adjective from 1690s.

Wiktionary
rhomboid

a. resembling, or shaped like a rhombus or rhomboid n. 1 A parallelogram which is neither a rhombus nor a rectangle 2 Any of several muscles that control the shoulders 3 A solid shape which has rhombic faces

WordNet
rhomboid
  1. n. a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal

  2. any of several muscles of the upper back that help move the shoulder blade [syn: rhomboid muscle]

rhomboid

adj. shaped like a rhombus or rhomboid; "rhomboidal shapes" [syn: rhomboidal]

Wikipedia
Rhomboid

Traditionally, in two-dimensional geometry, a rhomboid is a parallelogram in which adjacent sides are of unequal lengths and angles are non-right angled.

A parallelogram with sides of equal length ( equilateral) is a rhombus but not a rhomboid.

A parallelogram with right angled corners is a rectangle but not a rhomboid.

The term rhomboid is now more often used for a parallelepiped, a solid figure with six faces in which each face is a parallelogram and pairs of opposite faces lie in parallel planes. Some crystals are formed in three-dimensional rhomboids. This solid is also sometimes called a rhombic prism. The term occurs frequently in science terminology referring to both its two- and three-dimensional meaning.

Usage examples of "rhomboid".

I went right to it, and all my symbols were there -- circles, triangles, japps, mirks, rhomboids, bews, smims, fouders, hundreds more.

Drawing and redrawing the circles, triangles, rhomboids, pentagrams, rectangles, sine curves and twisted ovals of infinity, they smoothed them away once again, and began again.

Another trick was to leave flaccid that part of the serratus magnus which is attached to the inferior angle of the scapula whilst he roused energetic contraction in the rhomboids.

Nownow he might as well have been in one of those obsolete rhomboids himself.

The only notable break that occurred anywhere in that gleaming case-hardened rhomboid was the small square panel in one side where the combination lock showed narrow segments of its four milled and lettered chrome-steel wheelsand even those were matched and balanced into their aperture so infrangibly that a bacillus on hunger strike would have felt cramped between them.

The patterns incorporated not only chevrons but triangles, zigzags, rhomboids, and right-angled spirals, in both blue and red.

There were other points of light that were in fact potato-shaped stony worldlets of various sizes, some carrying loads of instruments, the axled wheels of the old spacestation, the squares and rhomboids of advertising signs (hardly used now—they proved unpopular and counterproductive), high aircraft and spacecraft, and, higher still and parked in their plodding orbits, the old slowboats that had brought the original colonists.

The rhomboid was full of black inclusions and pulsed steadily in and out, like an enormous slab-sided lung.

The rhomboid was full of black inclusions and pulsed steadily in and out, like an enormous slab‑sided lung.

He can't stop walking, moves around the courtyard in a random sequence of unconscious geometries, his footsteps tracing out a series of ellipses, trapeziums, rhomboids, ovals, rings.