GNU Collaborative International Dictionary of English

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1.       
   ‖Solarium , n.; pl. Solaria . [L. See Solar, n.]
   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
   (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