Source : Webster's Revised Unabridged Dictionary (1913)

Decker \Deck"er\, n.
   1. One who, or that which, decks or adorns; a coverer; as, a
      table decker.

   2. A vessel which has a deck or decks; -- used esp. in
      composition; as, a single-decker; a three-decker.

Source : WordNet®

Decker
     n 1: English dramatist and pamphleteer (1572-1632) [syn: {Dekker},
           {Thomas Dekker}, {Thomas Decker}]
     2: (often used in combinations) something constructed with
        multiple levels; "they rode in a double-decker bus"