/ Dictionary / Index P physis: Meaning and Definition of Find definitions for: phy•sis Pronunciation: (fī'sis), [key] — pl. -ses the principle of growth or change in nature. nature as the source of growth or change. something that grows, becomes, or develops. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. physique physo- 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