zedbedhttp://www.oed.com/dictionary/zedbed_n%3Ftab%3Dmeaning_and_usezedbed, n.
First published 2005

zedbednoun

Originally and chiefly British.
  1. 1954–
    A type of occasional bed with a three-part metal frame which folds up for storage; (also more generally) any of various types of portable folding bed; cf. Z-bed n.
    A proprietary name in the United States.
    1. 1954
      Their latest ‘convertible’ is the Zedbed, which costs 9½ guineas, and which will be in the shops within the next few weeks.
      Irish Times 6 May 8/3
    2. 1970
      Double zedbed,..size 6 ft. 2 ins. × 3 ft. 10 ins. wide.
      Kay's Catalogue Autumn–Winter 654/2
    3. 2003
      The zed-bed has been superseded by the sofabed and the futon because they double up as functional bits of furniture.
      Cabinet Maker (Nexis) 21 March 12

Originally published as part of the entry for zed, n.

zedbed, n. was first published in 2005.