Word Origin See more synonyms on Thesaurus.com noun, plural rhom·bus·es, rhom·bi . [ rom-bahy] /ˈrɒm baɪ/ an oblique-angled equilateral parallelogram; any equilateral parallelogram except a square. an equilateral parallelogram, including the square as a special case. a rhombohedron. Origin of rhombus 1560–70; < Latin < Greek rhómbos anything that may be spun around, derivative of rhémbein to revolve
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for rhombi noun plural -buses or -bi ( -baɪ) an oblique-angled parallelogram having four equal sides Also called: rhomb Compare square (def. 1) Word Origin
C16: from Greek
rhombos something that spins; related to rhembein to whirl
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for rhombi rhombus n.
1560s, from Late Latin
rhombus, from Greek rhombos "rhombus, rhomb, lozenge; spinning top, maghic wheel used by sorcerers; a spinning motion," from rhembesthai "to spin, whirl," from PIE *wrembh-, from *werbh- "to turn, twist, bend" (cf. Old English weorpan "to throw away"), from root *wer- (3) "to turn, bend" (see versus).
Online Etymology Dictionary, © 2010 Douglas Harper
Plural rhombuses rhombi ( rŏm) ′bī A parallelogram with four equal sides; an equilateral parallelogram. Related forms rhomboid, rhomboidal adjective
The American Heritage® Science Dictionary
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