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isosceles

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i⋅sos⋅ce⋅les

[ahy-sos-uh-leez]
–adjective
(of a straight-sided plane figure) having two sides equal: an isosceles triangle; an isosceles trapezoid.


Origin:
1545–55; < LL < Gk isoskels with equal legs, equiv. to iso- iso- + skél(os) leg + -ēs adj. suffix
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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i·sos·ce·les   (ī-sŏs'ə-lēz')   


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adj.   Mathematics
Having two equal sides: an isosceles triangle.

[Late Latin īsoscelēs, from Greek īsoskelēs : īso-, iso- + skelos, leg.]
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

isosceles 
1551, from L.L. isosceles, from Gk. isoskeles "with equal sides," from isos "equal" + skelos "leg" (see scalene).
Online Etymology Dictionary, © 2001 Douglas Harper
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