• IPA(key): /e.kʁu/
  • (file)

Etymology 1Edit

Masculinized form from Middle French escroue, from Old French escroe, from Latin scrōfa, originally ‘sow (female pig)’;[1] compare Occitan escrofa ‘screw nut’, Calabrese scrufina ‘screw nut’. The change in meaning is also found in Spanish puerca, Portuguese porca, both ‘sow; screw nut’, 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.


écrou m (plural écrous)

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

Etymology 2Edit

From Middle French escrou ‘scrap, strip of parchment, scroll’, from Old French escroe, from Old Dutch *skrōda (end, flap) (compare Middle Dutch scrōde), from Proto-Germanic *skrudaz, derivative of Proto-Germanic *skrudaną (compare Dutch schrooien ‘to shred’). Lent English scrow, scroll.


écrou m (plural écrous)

  1. A prison register, prison admission form.
Derived termsEdit



  1. ^ Merriam-Webster's Collegiate Dictionary, 11th edn., s.v. "screw".

Further readingEdit