Crossword Genius

A triangle with two equal sides (9)

Ross

I believe the answer is:

isosceles

'a triangle with two equal sides' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for isosceles that I've seen before include "Triangle with two sides of equal length" , "Describing a triangle with two equal sides" , "Of triangular, with two sides of equal length" , "Kind of triangle" , "(Of triangles) having two sides the same" .)

I've seen this clue in the Sydney Morning Herald.
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