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noun
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.
Definition source: English Wiktionary via Wiktextract
Usage: countable, historical, uncountable
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
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.” From Ancient Greek αἰθέριος (aithérios), from αἰθήρ (aithḗr, “upper heaven”).
