\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.
2. (Zo["o]l.) 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}.