Breadcrumb Home > Dictionary > Index G galactosemia: Meaning and Definition of Find definitions for: ga•lac•to•se•mi•a Pronunciation: (gu-lak"tu-sē'mē-u), [key] — n. Pathol. an inherited disorder characterized by the inability to metabolize galactose and requiring a galactose-free diet to avoid consequent mental retardation and eye, spleen, and liver abnormalities. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: galactosemia (Thesaurus) galactose galago ✖ Related Content Daily Word Quiz: musth Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language