/ Dictionary / Index G galactin: Meaning and Definition of Find definitions for: ga•lac•tin Pronunciation: (gu-lak'tin), [key] — n. Biochem. prolactin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. galactic year galacto- Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language