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Webster 1913 Edition

Adj.

[L.

aequicrurius

;

aequus

equal +

crus

cruris

, leg.]

Having equal legs or sides; isosceles.

[R.]

“Equicrural triangles.”

Sir T. Browne.

Adj.

[L. oequus, equal and crus, a leg.] Having legs of equal length.

Having equal legs, but longer than the base; isosceles; as an equicrural triangle.

equicrural ‎(comparative more equicrural, superlative most equicrural)

Having legs of equal size; isosceles.
- 1658: The same is not forgot by Lapidaries while they cut their gemms pyramidally, or by æquicrural triangles. — Sir Thomas Browne, The Garden of Cyrus (Folio Society 2007, p. 174)