/ Dictionary / Index A alkaline phosphatase: Meaning and Definition of Find definitions for: al'kaline phos'phatase Pronunciation: [key] — n. Biochem. a phosphatase active in an alkaline medium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. alkaline-earth metal alkalinity Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language