Source : Webster's Revised Unabridged Dictionary (1913)

Keslop \Kes"lop\, n. [AS. c?selib, or c?slyb, milk curdled; cf.
   G. k["a]selab, k["a]selippe. See {Cheese}, and
   cf.{Cheeselep}.]
   The stomach of a calf, prepared for rennet. --Halliwell.