/ Dictionary / Index P polyphasic: Meaning and Definition of Find definitions for: pol•y•pha•sic Pronunciation: (pol"ē-fā'zik), [key] — adj. having more than two phases. habitually doing more than one thing at a time: a polyphasic personality. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polyphase Polyphemus Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language