/ Dictionary / Index P plani-: Meaning and Definition of Find definitions for: plani- Pronunciation: [key] var. of: planigraph. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. planh planiform Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language