/ Dictionary / Index S sublethal: Meaning and Definition of Find definitions for: sub•le•thal Pronunciation: (sub-lē'thul), [key] — adj. almost lethal or fatal: a sublethal dose of poison. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sublet sub-level 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