Solar means coming from or belonging to the sun. Solar power, solar panels, the solar system.
Solar panels convert sunlight into electricity, and solar thermal systems use it to heat water — two different technologies with one name. The solar system is the sun and everything orbiting it. A solar year is the time the earth takes to go round once. Note solar eclipse, when the moon passes in front of the sun; solar flare; and the solar plexus, a nerve cluster named for radiating outward like rays.
1adjectivesolarComing from or belonging to the sun.
“Solar panels cover about half the roof.”
solar is a quality relating to the sun.
Latin solaris comes from sol, the sun — the same root as solstice, meaning the sun standing still, and the name Sol. The Germanic word for the sun is a cousin, which is why sun and sol resemble each other.
Proto-Indo-European
*sóh₂wl̥ — sun
Latin
sōlāris
Middle English
solar
English, today
solar
Built from
From Late Middle English solar, from Latin sōlāris, from sōl (“sun”), from Proto-Indo-European sóh₂wl̥ (“sun”).
Etymology from Wiktionary, CC BY-SA