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isosceles

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

Origin of isosceles

1545–55; < Late Latin < Greek isoskelḗs with equal legs, equivalent to iso- iso- + skél(os) leg + -ēs adj. suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for isosceles

isosceles

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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

isosceles in Science

isosceles

[ī-sŏsə-lēz′]
  1. Of or relating to a geometric figure having at least two sides of equal length.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.