clitoris

From post-classical New Latin clītoris (16th century), from Koine Greek κλειτορίς (kleitorís), probably from Ancient Greek κλείω (kleíō, “to sheathe, shut”), in reference to it being covered by the labia minora. The related noun form κλείς (kleís) has a second meaning of "a key, a latch or hook (to close a door)." Wooden pegs were the original keys; a connection also revealed in Latin clavis (“nail”) and claudere (“to shut”) (see close).

出典: Wiktionary「clitoris」（CC BY-SA 4.0）