/ Dictionary / Index L Lysol: Meaning and Definition of Find definitions for: Ly•sol Pronunciation: (lī'sôl, -sol), [key] — Trademark. Trademark. a brand of clear, brown, oily solution of cresols in soap, used as a disinfectant and antiseptic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lysol (Thesaurus) lysogeny lysosome Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language