/ Dictionary / Index D deadlight: Meaning and Definition of Find definitions for: dead•light Pronunciation: (ded'līt"), [key] — n. Naut. a strong shutter able to be screwed against the interior of a porthole in heavy weather. a thick pane of glass set in the hull or deck to admit light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: deadlight (Thesaurus) dead lift deadline Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language