From Middle English renet, a variant of renelesse, renels, renlys, rendlys (“rennet”), from rennen (“to run”), from Old English rennan, from Proto-Germanic *rannijaną. Compare Middle Dutch rinsel, runsel (“rennet”), Old English ġerennan (“to coagulate”), German gerinnen (“to coagulate; congeal”).
- runnet (dialectal)
- 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.
rennet (plural rennets)
- A kind of apple.