crotch

(noun) the region of the angle formed by the junction of two branches. Synonyms: fork. Examples: "They took the south fork." "He climbed into the crotch of a tree."

(noun) the angle formed by the inner sides of the legs where they join the human trunk. Synonyms: fork.

(noun) external sex organ. Synonyms: genitalia, genital organ, genitals, private parts, privates.