n. A sundial, fixed or portable. See dial, poke-dial, ring-dial, sun-dial.n. A place arranged to receive the sun's rays, usually a flat house-top, terrace; or open gallery, formerly used for pleasure only, but in modern times commonly as an adjunct of a hospital or sanatorium, in which case it is inclosed with glass; a room arranged with a view to giving patients sun-baths.n. The typical genus of Solariidæ, containing the staircase-shells, as the perspective shell, S. perspectivum.