ISOSCELES Meaning of ISOSCELES in English [ ʌɪ'sɒsɪli:z ]■ adjective (of a triangle) having two sides of equal length.OriginC16: via late L. from Gk isoskelēs , from isos 'equal' + skelos 'leg'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004