WordNet (r) 3.0 (2006):

sun lounge
    n 1: a room enclosed largely with glass and affording exposure
         to the sun [syn: sun parlor, sun parlour, sun porch,
         sunporch, sunroom, sun lounge, solarium]

The Jargon File (version 4.4.7, 29 Dec 2003):

sun lounge
 n.

    [UK] The room where all the Sun workstations live. The humor in this term
    comes from the fact that it's also in mainstream use to describe a
    solarium, and all those Sun workstations clustered together give off an
    amazing amount of heat.


The Free On-line Dictionary of Computing (30 December 2018):

sun lounge

    (Great Britain) The room where all the Sun
   workstations live.  The humour in this term comes from the
   fact that it's also in mainstream use to describe a solarium,
   and all those Sun workstations clustered together give off an
   amazing amount of heat.

   [Jargon File]

   (1995-01-19)