/ Dictionary / Index C colostrum: Meaning and Definition of Find definitions for: co•los•trum Pronunciation: (ku-los'trum), [key] — n. a yellowish liquid, esp. rich in immune factors, secreted by the mammary gland of female mammals a few days before and after the birth of their young. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: colostrum (Thesaurus) colostomy colotomy Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language