rhombus

[rom-buhs]
noun, plural rhombuses, rhombi [rom-bahy] .
1.
an oblique-angled equilateral parallelogram; any equilateral parallelogram except a square.
2.
an equilateral parallelogram, including the square as a special case.
3.
a rhombohedron.

Origin:
1560–70; < Latin < Greek rhómbos anything that may be spun around, derivative of rhémbein to revolve

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To rhombus
Collins
World English Dictionary
rhombus (ˈrɒmbəs)
 
n , pl -buses, -bi
Compare square Also called: rhomb an oblique-angled parallelogram having four equal sides
 
[C16: from Greek rhombos something that spins; related to rhembein to whirl]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History

rhombus
1567, from L.L. rhombus, from Gk. rhombos "rhombus, spinning top," from rhembesthai "to spin, whirl," from PIE *wrembh-, from *werbh- "to turn, twist, bend" (cf. O.E. weorpan "to throw away"), from base *wer- (see versus)
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Science Dictionary
rhombus   (rŏm'bəs)  Pronunciation Key 
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.
Cite This Source
Example sentences
D is a rhombus because all four sides are congruent.
The rhombus has two acute angles, four angles, and equal sides and is a parallelogram.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature