/ Dictionary / Index P photobiotic: Meaning and Definition of Find definitions for: pho•to•bi•ot•ic Pronunciation: (fō"tō-bī-ot'ik, -bē-), [key] — adj. Bot., Zool. living or thriving only in the presence of light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photobiology photocatalysis Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language