(of a straight-sided plane figure) having two sides equal: an isosceles triangle; an isosceles trapezoid.

1545–55; < Late Latin < Greek isoskelḗs with equal legs, equivalent to iso- iso- + skél(os) leg + -ēs adj. suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isosceles (aɪˈsɒsɪˌliːz)
1.  (of a triangle) having two sides of equal length
2.  (of a trapezium) having the two nonparallel sides of equal length
[C16: from Late Latin, from Greek isoskelēs, from iso- + skelos leg]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1551, from L.L. isosceles, from Gk. isoskeles "with equal sides," from isos "equal" + skelos "leg" (see scalene).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
isosceles   (ī-sŏs'ə-lēz')  Pronunciation Key 
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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Example sentences
Draw a circle in the center and then five lines from the center to the corners to create five isosceles triangles.
The figure shows a row of six solid white isosceles triangles.
Ask students to find two right angle isosceles triangles and predict what will
  be formed when they slide them together.
They will then find measures of the angles using the properties of isosceles
  and right triangles.
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