galactosyltransferase /ɡəˌlaktəs(ʌ)ɪlˈtɹanzfəɹeɪz/ noun1 •Any glycosyltransferase enzyme that catalyzes the transfer of galactose entities.The gene is the recipe for galactosyl transferase, an enzyme, i.e. a protein with the ability to catalyse a chemical reaction. — 1999 formsgalactosyltransferases