/ Dictionary / Index H half deck: Meaning and Definition of Find definitions for: half' deck" Pronunciation: [key] (in a sailing ship) the portion of the deck below the upper or spar deck and aft of the mainmast. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. half-cup half dime Related Content Daily Word Quiz: divulge Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language