isosceles

[ahy-sos-uh-leez]

adjective

1. (of a straight-sided plane figure) having two sides equal.

   an isosceles triangle; an isosceles trapezoid.

isosceles

/ aɪˈsɒsɪˌliːz /

adjective

1. (of a triangle) having two sides of equal length

2. (of a trapezium) having the two nonparallel sides of equal length

isosceles

1. Of or relating to a geometric figure having at least two sides of equal length.

Word History and Origins

Origin of isosceles¹

1545–55; < Late Latin < Greek isoskelḗs with equal legs, equivalent to iso- iso- + skél ( os ) leg + -ēs adj. suffix

Word History and Origins

Origin of isosceles¹

C16: from Late Latin, from Greek isoskelēs, from _iso- + skelos leg