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

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

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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]

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Word Origin & History

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
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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.
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