Dictionary

isosceles

adjective isos·ce·les \ī-ˈsäs-ˌlēz, -ˈsä-sə-\

Definition of ISOSCELES

1
of a triangle :  having two equal sides — see triangle illustration
2
of a trapezoid :  having the two nonparallel sides equal
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Origin 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: 1551

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