/ Dictionary / Index N nucleosidase: Meaning and Definition of Find definitions for: nu•cle•o•sid•ase Pronunciation: (n"klē-u-sī'dās, -dāz, ny"-), [key] — n. Biochem. any of the class of enzymes that catalyze the hydrolysis of nucleosides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nucleoprotein nucleoside Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language