/ Dictionary / Index R rennet: Meaning and Definition of Find definitions for: ren•net Pronunciation: (ren'it), [key] — n. the lining membrane of the fourth stomach of a calf or of the stomach of certain other young animals. the rennin-containing substance from the stomach of the calf. a preparation or extract of the rennet membrane, used to curdle milk, as in making cheese, junket, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rennet (Thesaurus) Rennes Rennie Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language