rennet
n.
1
"inner membrane of a calf's fourth stomach," c.1400, probably from an unrecorded Old English *rynet, related to gerennan "cause to run together," because it makes milk run or curdle; from Proto-Germanic *rannijanan, causative of *renwanan "to run" (see run, v.). Compare German rinnen "to run," gerinnen "to curdle."
2
variety of apple, 1560s, from French reinette, literally "little queen," diminutive of reine "queen," from Latin regina (see Regina).