I. sōˈla(a)rēəm, səˈl-, -ler-, -lār- noun
( plural solar·ia -ēə ; see sense 2 )
Etymology: Latin, sundial, part of a house exposed to the sun, flat house, terrace, from sol sun + -arium — more at solar
1. : a Roman sundial or clock (as a water clock)
2. plural also solariums : an apartment exposed to the sun: as
a. : an apartment on the roof of an ancient dwelling
b. : the solar of a medieval residence
c. : a glass-enclosed porch or living room : sun parlor
d. : a room (as in a hospital) for exposure of the body to sunlight (as in sunbathing) or for the treatment of illness by therapeutic light
3. : a snail of Architectonica or a related genus : sundial shell
II.
Etymology: New Latin, from Latin, sundial
synonym of architectonica