rhomb

n. செவ்வகம், சாய்சதுரம், சரிசம பக்கங்களடைய,இணைவகம், வயிரவடிவ் பொருள்,வயிரக்கல், வயிர வடிவத் தித்திப்புப் பண்டம், ஆறு செவ்வகமுகப்புக்களையுடைய மணியுரப்படிகம்.

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Rhomb, n. Etym: [L. rhombus, Gr. wrench: cf. F. rhombe. Cf. Rhombus, Rhumb.] 1. (Geom.) Defn: 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.) Defn: 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. Nichol.

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