écrou

Etymology 1
Masculinized form from, from , from , originally ; compare 🇨🇬, 🇨🇬. The change in meaning is also found in, , both , and is based on the fact that a boar's penis has a screw-like tip, making the sow's vulva equivalent to a screw nut by analogy.

Noun

 * 1) nut (that fits on a bolt), female screw

Etymology 2
, from, from (compare 🇨🇬), from , derivative of  (compare 🇨🇬). Cognate with 🇨🇬,.

Noun

 * 1) a prison register, prison admission form