Main Entry: so·lar

Pronunciation: \ˈsō-lər, -ˌlär\

Function: adjective

Etymology: Middle English, from Latin solaris, from sol sun; akin to Old English & Old Norse sōl sun, Lithuanian saulė, Greek hēlios

Date: 15th century

1 : of, derived from, relating to, or caused by the sun
2 : measured by the earth's course in relation to the sun <a solar year>; also : relating to or reckoned by solar time
3 a : produced or operated by the action of the sun's light or heat <solar energy> b : utilizing the sun's rays especially to produce heat or electricity <a solar house>; also : of or relating to such utilization <solar design>