adjective so·lar \ˈsō-lər, -ˌlär\

: of or relating to the sun

: produced by or using the sun's light or heat

Full Definition of SOLAR

:  of, derived from, relating to, or caused by the sun
:  measured by the earth's course in relation to the sun <a solar year>; also :  relating to or reckoned by solar time
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>

Origin of SOLAR

Middle English, from Latin solaris, from sol sun; akin to Old English & Old Norse sōl sun, Lithuanian saulė, Greek hēlios
First Known Use: 15th century

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