- (context, poetic, _, or, _, literary) The sky or heavens; the upper air.
- (context, ancient philosophy) A classical physical element, considered as prevalent in the heavens and inaccessible to humans.
- 2002, Philip Ball, The Elements: A Very Short Introduction, Oxford 2004, p. 10
- :There is thus a fifth classical element, which Aristotle called the . But it is inaccessible to earthly beings, and so plays no part in the constitution of mundane matter.
- (context, physics, archaic) An elastic substance once thought to fill all space, and to allow for the transmission of light.
- (chemistry) A volatile liquid, C4H10O, formed from the addition of sulphuric acid to alcohol (now only spelled ether).
Etymology: From (term, íther, , the upper pure, bright air, lang=la) < Ancient Greek (term, sc=polytonic, á, tr=aithÄr, , upper air, lang=grc) < (term, sc=polytonic, á, tr=aithÅ, , I burn, shine, lang=grc).
- Spanish: (t, es, éter, m)
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