Plural of ether: a light, colorless chemical compound used in anesthesia and solvents, or in older beliefs, a mysterious substance thought to fill space.
From Old English 'æther' and Latin 'aether', derived from Greek 'aithēr' meaning 'upper air' or 'sky'. Originally referred to the divine substance of heaven in classical cosmology.
Before we had MRI machines, ether was the magic potion that put patients to sleep during surgery—the first time doctors could perform painless operations, revolutionizing medicine overnight.
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