/ Dictionary / Index P pyran: Meaning and Definition of Find definitions for: py•ran Pronunciation: (pī'ran, pī-ran'), [key] — n. Chem. either of two compounds having the formula CHO, containing one oxygen and five carbon atoms arranged in a six-membered ring. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pyramus and Thisbe pyranose 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