/ Dictionary / Index T twilight sleep: Meaning and Definition of Find definitions for: twi'light sleep" Pronunciation: [key] — Med. Med. a state of semiconsciousness, usually produced by hypodermic injections of scopolamine and morphine, used chiefly to effect relatively painless childbirth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Twilight of the Gods twilight zone Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language