Isosceles

·adj Having two legs or sides that are equal;

— said of a triangle.

isosceles
īsoscĕles, is, adj., m., = ἰσοσκελής, having equal legs , isosceles , Aus. praef. ad Idyll. 13. ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
isosceles
A triangle with only two of its sides equal. ...

The Sailor's Word-Book