[ suh-lair-ee-uh m, soh- ]
/ səˈlɛər i əm, soʊ- /

noun, plural so·lar·i·ums, so·lar·i·a [suh-lair-ee-uh, soh-] /səˈlɛər i ə, soʊ-/.

a glass-enclosed room, porch, or the like, exposed to the sun's rays, as at a seaside hotel or for convalescents in a hospital.

Origin of solarium

1815–25; < Latin sōlārium balcony, terrace, equivalent to sōl the sun + -ārium -ary Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for solarium

British Dictionary definitions for solarium

/ (səʊˈlɛərɪəm) /

noun plural -lariums or -laria (-ˈlɛərɪə)

a room built largely of glass to afford exposure to the sun
a bed equipped with ultraviolet lights used for acquiring an artificial suntan
an establishment offering such facilities

Word Origin for solarium

C19: from Latin: a terrace, from sōl sun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012