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rhombus

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Rhombus math
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rhom⋅bus

  [rom-buhs]
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–noun, plural -bus⋅es, -bi  [-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; < L < Gk rhómbos anything that may be spun around, deriv. of rhémbein to revolve
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Rhombus math
Identify rhombi and other shapes, find area and perimeter, much more!
www.ixl.com/math
rhom·bus   (rŏm'bəs)   


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n.   pl. rhom·bus·es or rhom·bi (-bī)
An equilateral parallelogram.

[Late Latin, from Latin, flatfish, magician's circle, from Greek rhombos, rhombus; see wer-2 in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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