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The Collaborative International Dictionary

Rhomb \Rhomb\ (r[o^]mb or r[o^]m; 277), n. [L. rhombus, Gr. "ro`mbos rhomb, a spinning top, magic wheel, fr. "re`mbein to turn or whirl round, perhaps akin to E. wrench: cf. F. rhombe. Cf. Rhombus, Rhumb.]

  1. (Geom.) An equilateral parallelogram, or quadrilateral figure whose sides are equal and the opposite sides parallel. The angles may be unequal, two being obtuse and two acute, as in the cut, or the angles may be equal, in which case it is usually called a square.

  2. (Geom.) A rhombohedron.

    Fresnel's rhomb (Opt.), a rhomb or oblique parallelopiped of crown or St. Gobain glass so cut that a ray of light entering one of its faces at right angles shall emerge at right angles at the opposite face, after undergoing within the rhomb, at other faces, two reflections. It is used to produce a ray circularly polarized from a plane-polarized ray, or the reverse.

Douglas Harper's Etymology Dictionary

1570s, from Middle French rhombe, from Latin rhombus (see rhombus).


n. 1 A rhombus. 2 A rhombohedron.


n. a parallelogram with four equal sides; an oblique-angled equilateral parallelogram [syn: rhombus]


Usage examples of "rhomb".

See how in warlike muster they appear, In rhombs, and wedges, and half-moons, and wings.

These rhombs have certain angles, and the three which form the pyramidal base of a single cell on one side of the comb, enter into the composition of the bases of three adjoining cells on the opposite side.

I have noticed half-completed rhombs at the base of a just-commenced cell, which were slightly concave on one side, where I suppose that the bees had excavated too quickly, and convex on the opposed side, where the bees had worked less quickly.