Equicrural vs. Isosceles: What's the Difference?

Having legs of equal size; isosceles.

Having at least two equal sides

Having equal legs or sides; isosceles.

(geometry) Having (at least) two sides of equal length, used especially of a triangle or trapezoid.

Having two legs or sides that are equal; - said of a triangle.

(of a triangle) having two sides of equal length