solarium

from WordNet (r) 3.0 (2006)

solarium
    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}]

from The Collaborative International Dictionary of English v.0.48

Solarium \So*la"ri*um\, n.; pl. {Solaria}. [L. See {Solar}, n.]
   1. An apartment freely exposed to the sun; anciently, an
      apartment or inclosure on the roof of a house; in modern
      times, an apartment in a hospital, used as a resort for
      convalescents.
      [1913 Webster]

   2. (Zool.) Any one of several species of handsome marine
      spiral shells of the genus {Solarium} and allied genera.
      The shell is conical, and usually has a large, deep
      umbilicus exposing the upper whorls. Called also
      {perspective shell}.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

20 Moby Thesaurus words for "solarium":
      best room, drawing room, foreroom, front room, gallery, lanai,
      living room, parlor, patio, piazza, porch, salon, saloon,
      sitting room, sleeping porch, stoop, sun parlor, sun porch,
      sunroom, veranda