The Collaborative International Dictionary of English v.0.48:

Deck chair \Deck" chair`\, n.
   a folding chair, usually having arms and a full-length leg
   rest; -- used for relaxing on the deck of a ship, at
   poolside, etc. Also called steamer chair
   [PJC]

WordNet (r) 3.0 (2006):

deck chair
    n 1: a folding chair for use outdoors; a wooden frame supports a
         length of canvas [syn: deck chair, beach chair]