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[rom-buh s] /ˈrɒm bəs/
noun, plural rhombuses, rhombi
[rom-bahy] /ˈrɒm baɪ/ (Show IPA)
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for rhombus


noun (pl) -buses, -bi (-baɪ)
an oblique-angled parallelogram having four equal sides Also called rhomb Compare square (sense 1)
Word Origin
C16: from Greek rhombos something that spins; related to rhembein to whirl
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for rhombus

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
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rhombus in Science
Plural rhombuses or rhombi (rŏm'bī)
A parallelogram with four equal sides; an equilateral parallelogram.

rhomboid, rhomboidal adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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