/ Dictionary / Index S somnambulism: Meaning and Definition of Find definitions for: som•nam•bu•lism Pronunciation: (som-nam'byu-liz"um, sum-), [key] — n. sleepwalking. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: somnambulism (Thesaurus) somnambulate somnifacient Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language