victoriousvocabulary:

CLITHRIDIATE

[adjective]

having the shape of a keyhole.

Etymology: uncertain.

[Esao Andrews]

So similar to ‘clitoris’ – and possibly similar in origin: 

Word Origin and History for clitoris: (from dictionary.com)

“erectile organ of female mammals,” 1610s, coined in Modern Latin from Late Greek kleitoris, a diminutive, but the exact sense intended by the coiners is uncertain. Perhaps from Greek kleiein “to sheathe,” also “to shut,"in reference to its being covered by the labia minora. The related Greek noun form kleis has a second meaning of "a key, a latch or hook (to close a door);” see close (v.), and cf. slot (n.2).