Dictionary.com
definitions

sun deck

or sun·deck

noun
  1. a raised, open area, as a roof, terrace, or ship's deck, that is exposed to the sun.

Origin of sun deck

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for sun deck

sun deck

noun
  1. an upper open deck on a passenger ship
  2. US, Australian and NZ a balcony or deck attached to a house, originally used for sunbathing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012