Etymology · Ancient Greek
αἰθέριος
2 English words descend from Ancient Greek αἰθέριος, most common first.
- etherealPertaining to the presupposition of an invisible air-like element permeating all of space, or to the higher regions beyond the earth or beyond the atmosphere.
- etherionA gas formerly believed to exist in air, initially identified by Charles F. Brush in 1898. He estimated that its density was one ten-thousandth of hydrogen.