ether

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ether /ˈiːθɚ/ noun
ether
/ˈiːθɚ/
noun
Learner's definition of ETHER
[noncount]
: a liquid that burns easily, that is used to turn solid substances into liquid, and that was used in medicine in the past to prevent patients from feeling pain during operations
the ether : the air : the sky
used especially when describing electronic signals that travel through the air