Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The inner lining of the fourth stomach of calves and other young ruminants.
  • n. A dried extract made from the stomach lining of a ruminant, used in cheesemaking to curdle milk.
  • n. See rennin.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An enzyme used as the first step in making cheese, to curdle the milk and coagulate the casein in it, derived by soaking the fourth stomach of a milk-fed calf in brine.
  • n. A kind of apple.

from the GNU version of the Collaborative International Dictionary of English

  • n. A name of many different kinds of apples. Cf. reinette.
  • n. The inner, or mucous, membrane of the fourth stomach of the calf, or other young ruminant.
  • n. an infusion or preparation of the calf stomach lining, used for coagulating milk. The active principle in this coagulating action is the enzyme rennin.

from The Century Dictionary and Cyclopedia

  • To mix or treat with rennet.
  • n. The fourth stomach of a calf prepared for curdling milk; the rennet-bag.
  • n. Anything used to curdle milk.
  • n. A kind of apple, said to have been introduced into England in the reign of Henry VIII. Also called renneting.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a substance that curdles milk in making cheese and junket

Etymologies

Middle English, probably from Old English *rynet; see rei- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
French reinette (Wiktionary)

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  • "A kind of apple, said to have been introduced into England in the reign of Henry VIII. Also called renneting."

    -- from the Century

    March 24, 2014

  • a.k.a. cheese-running (now obs.)

    September 28, 2010

  • Just walk away, Rennet.

    January 20, 2009

  • cartoon henchcharacter of Stimpet.

    January 20, 2009

  • "Tenner" in reverse, as in "I'll put a tenner on Secretariat".

    February 7, 2007