/ Dictionary / Index P pyronine: Meaning and Definition of Find definitions for: py•ro•nine Pronunciation: (pī'ru-nēn"), [key] — n. Histol. a xanthine dye used for detecting the presence of RNA. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyrone pyrope Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language