Webster's English Dictionary

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solar

so.lar \'so--l*r\ aj [ME, fr. L solaris, fr. sol sun; akin to OE & ON so-l 
   sun,] Gk he-lios 1: of, derived from, or relating to the sun esp. as 
   affecting the earth  2: measured by the earth's course in relation to the 
   sun {~ time (R@ year}; also : relating to or reckoned by solar time 3: 
   produced or operated by the action of the sun's light or heat; also)X : 
   utilizing the sun's rays