Pronunciation: (ren'it), [key]
1. the lining membrane of the fourth stomach of a calf or of the stomach of certain other young animals.
2. the rennin-containing substance from the stomach of the calf.
3. 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.