资料来源 : Webster's Revised Unabridged Dictionary (1913)

Renning \Ren"ning\ (r?n"n?ng), n.
   See 2d {Rennet}. [Obs.]

         Asses' milk is holden for to be thickest, and therefore
         they use it instead of renning, to turn milk.
                                                  --Holland.