First Known Use: 1551
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
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