noun
Aether
noun
1
An old term for the clear upper air thought to fill the sky above the clouds, later used in science for a hypothetical substance once believed to fill space.
"Ancient writers imagined the gods breathing pure aether high above the clouds."
"Nineteenth-century physicists searched for the aether they believed light waves travelled through."
How to Use Aether
Learner’s notesIn plain EnglishA poetic or old-fashioned word for the sky’s upper reaches, or a once-believed substance filling empty space.
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Ancient writers imagined the gods breathing pure _____ high above the clouds.
Etymology
From Ancient Greek aithēr, "the upper air" — a doublet of the more familiar word "ether."