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isosceles

[ahy-sos-uh-leez] /aɪˈsɒs əˌliz/
adjective
1.
(of a straight-sided plane figure) having two sides equal:
an isosceles triangle; an isosceles trapezoid.
Origin of isosceles
1545-1555
1545-55; < Late Latin < Greek isoskelḗs with equal legs, equivalent to iso- iso- + skél(os) leg + -ēs adj. suffix
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for isosceles

isosceles

/aɪˈsɒsɪˌliːz/
adjective
1.
(of a triangle) having two sides of equal length
2.
(of a trapezium) having the two nonparallel sides of equal length
Word Origin
C16: from Late Latin, from Greek isoskelēs, from iso- + skelos leg
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for isosceles
adj.

"having two equal sides," 1550s, from Late Latin isosceles, from Greek isoskeles "with equal sides," from isos "equal" (see iso-) + skelos "leg" (see scalene).

Online Etymology Dictionary, © 2010 Douglas Harper
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isosceles in Science
isosceles
  (ī-sŏs'ə-lēz')   
Of or relating to a geometric figure having at least two sides of equal length.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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