UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈsəʊlər/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈsoʊlɚ/ ,USA pronunciation: respelling(sōlər; Archit. solər, sōlər)

WordReference Random House Learner's Dictionary of American English © 2020
so•lar1 /ˈsoʊlɚ/USA pronunciation   adj. 
  1. Astronomyof or relating to the sun:solar phenomena.
  2. Astronomycoming from the sun:solar radiation.
  3. determined by the sun:a solar hour.

WordReference Random House Unabridged Dictionary of American English © 2020
so•lar1  (sōlər),USA pronunciation adj. 
  1. Astronomyof or pertaining to the sun:solar phenomena.
  2. Astronomydetermined by the sun:solar hour.
  3. Astronomyproceeding from the sun, as light or heat.
  4. Energyutilizing, operated by, or depending on solar energy:a solar building; a solar stove.
  5. Timeindicating time by means of or with reference to the sun:a solar chronometer.
  6. Energymanufacturing or providing solar power:the solar industry.
  7. Astrologysubject to the influence of the sun.

  1. Energy[Informal.]See  solar energy. 
  • Latin sōlāris, equivalent. to sōl sun + -āris -ar1
  • late Middle English 1400–50

sol•ar2  (solər, sōlər),USA pronunciation n. 
  1. Architecturea private or upper chamber in a medieval English house.
Also,  sollar, soller. 
  • Latin
  • Latin sōlārium solarium; compare Old English solor, soler, Middle Dutch solre loft
  • Anglo-French soler, Old French solier
  • Middle English solar, soler bef. 900

Collins Concise English Dictionary © HarperCollins Publishers::
solar /ˈsəʊlə/ adj
  1. of or relating to the sun
  2. operating by or utilizing the energy of the sun: solar cell
  3. determined from the motion of the earth relative to the sun: solar year
  4. subject to the influence of the sun
Etymology: 15th Century: from Latin sōlāris, from sōl the sun
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