- The angle formed by the parting of two legs or branches; a
fork; the point where a trunk divides; as, the crotch of a tree. - A stanchion or post of wood or iron, with two arms for
supporting a boom, spare yards, etc.; -- called also crane and crutch.
Meaning of 'crotch' (Princeton's WordNet)
1 . crotch
[ n]
Meaning (1): - the region of the angle formed by the junction of two branches