etherion

English

Etymology

1898-12, Charles F. Brush, edited by J. Am. Chem. Soc., A new gas., volume 20, page 909:

[...] it seems really probable that it not only extends far beyond the atmosphere, but fills all celestial space at a very small pressure. In recognition of this probability, I have provisionally named it aetherion or etherion, meaning “high in the heavens.”

Noun

etherion (plural etherions)

1. A 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.