isosceles
isos·ce·les
adj \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
See 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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