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isosceles (adj.)

"having two equal sides," 1550s, from Late Latin isosceles, from Greek isoskeles "with equal legs; isosceles; that can be divided into two equal parts," from isos "equal, identical" (see iso-) + skelos "leg," from PIE *skel-es-, from root *skel- "bend, curve" (see scoliosis).

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Definitions of isosceles from WordNet

isosceles (adj.)
(of a triangle) having two sides of equal length;
From wordnet.princeton.edu