/ Dictionary / Index P planate: Meaning and Definition of Find definitions for: pla•nate Pronunciation: (plā'nāt), [key] — adj. having a plane or flat surface. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: planate (Thesaurus) planarian planation Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language