The –; hypothetical medium once believed to fill all space
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Related clues
- From the Greek for 'upper air', a word originally used to refer to matter once believed to permeate all space beyond the moon, later a distinctively sweet-scented volatile liquid
- Air beyond the clouds, poetically
- Clear upper air; solvent
- Word from the Latin for ''pure air''
- Volatile organic liquid once used as a general anaesthetic
Possible answers
- E
- T
- H
- E
- R