RHOMBUS
rhombus, rhomb, diamond
(noun) a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
Source: WordNet® 3.1
Etymology
Noun
rhombus (plural rhombi or rhombuses)
(geometry) A parallelogram having all sides of equal length. [from 16th c.]
The rhombus diamond, as one of the suits seen in a deck of playing cards ( or ).
In early Greek religion, an instrument whirled on the end of a string similar to a bullroarer.
(zoology, now rare) Any of several flatfishes, including the brill and turbot, once considered part of the genus Rhombus, now in Scophthalmus. [from 16th c.]
(zoology, archaic) Snails, now in genus Conus or family Conidae.
Synonyms
• (geometry): diamond (not in technical use), lozenge (if not square), rhomb
Source: Wiktionary
Rhom"bus, n. Etym: [L.]
Definition: Same as Rhomb, 1.
Source: Webster’s Unabridged Dictionary 1913 Edition