Webster's English Dictionary

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rennet

ren.net \'ren-*t\ n [ME, fr. (assumed) ME rennen to cause to coagulate, fr. 
   OE gerennan], fr. ge- together + (assumed) OE rennan to cause to run; akin 
   to OHG rennen to cause to run, OE rinnan to run - more at CO-, RUN 1a: the 
   contents of the stomach of an unweaned animal (as a calf)  1b: the lining 
   membrane of a stomach (as the fourth of a ruminant) used for  curdling 
   milk; also : a preparation of the stomach of animals used for this purpose 
   2a: RENNIN  2b: a substitute for rennin