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