/ Dictionary / Index L lactoferrin: Meaning and Definition of Find definitions for: lac•to•fer•rin Pronunciation: (lak"tu-fer'in), [key] — n. Biochem. a glycoprotein present in milk, esp. human milk, and supplying iron to suckling infants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lactobacillus lactoflavin Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language