5 letters · 5 points in Scrabble
adjective relating to or derived from the sun or utilizing the energies of the sun
originFrom Middle English solar, soler; from a conflation of Old English soler, solere (“raised platform; loft, upper room, upper part of a house, soler”), from Latin sōlārium; and Old English solor, salor (“residence, dwelling; hall; palace”), from Proto-West Germanic *salaʀ, from Proto-Germanic *salaz, *salą (“house, room, hall”). More at sale.
Etymology from Wiktionary, CC BY-SA 3.0