Source : Webster's Revised Unabridged Dictionary (1913)

Foremilk \Fore"milk`\, n. (Physiol.)
   The milk secreted just before, or directly after, the birth
   of a child or of the young of an animal; colostrum.

Source : WordNet®

foremilk
     n : milky fluid secreted for the first day or two after
         parturition [syn: {colostrum}]