Definition of isosceles
1 of a triangle : having two equal sides — see triangle illustration
2 of a trapezoid : having the two nonparallel sides equal
Recent Examples of isosceles from the Web
Geographically, Richland, Hammonton, and Absecon don't form an isosceles triangle.
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Origin and Etymology of isosceles
Late Latin isosceles having two equal sides, from Greek isoskelēs, from is- + skelos leg; perhaps akin to Old English sceol wry
First Known Use: 1551See Words from the same year
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