/ Dictionary / Index R retinol: Meaning and Definition of Find definitions for: ret•i•nol Pronunciation: (ret'n-ôl", -ol"), [key] — n. See a yellowish oil, CH, obtained by the distillation of resin, used as a solvent and as an antiseptic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: retinol (Thesaurus) retinoid retinopathy Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language