solar

Etymology 1

From Late Middle English solar, from Latin sōlāris, from sōl (“sun”), from Proto-Indo-European *sóh₂wl̥ (“sun”).

adj

1. Of or pertaining to the sun; proceeding from the sun
   solar light
   solar rays
   solar influence
2. (astrology, obsolete) Born under the predominant influence of the sun.
3. Measured by the progress or revolution of the sun in the ecliptic; as, the solar year.
4. Produced by the action of the sun, or peculiarly affected by its influence.
   Nor is solar power yet as cheap as the grid. 2013-07-20, “Out of the gloom”, in The Economist, volume 408, number 8845

noun

1. solar energy
   He’s a player in robots and solar, cryptocurrency and climate, brain-computer implants to stave off the menace of artificial intelligence and underground tunnels to move people and freight at super speeds. December 13 2021, Molly Ball, Jeffrey Kluger, Alejandro de la Garza, “Elon Musk: Person of the Year 2021”, in Time Magazine

Etymology 2

From 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.

noun

1. (obsolete) A loft or upper chamber forming the private accommodation of the head of the household in a medieval hall; a garret room.