anaesthesia /ˌanɪsˈθiːzɪə / ‹US› anesthesia

a

I. noun [ mass noun]

1. insensitivity to pain, especially as artificially induced by the administration of gases or the injection of drugs before surgical operations.

during anaesthesia body temperature falls due to the effect of drugs.
modern clinical anaesthesia uses low concentrations of volatile anaesthetics.
– origin early 18th cent.: modern Latin, from Greek anaisthēsia, from an- ‘without’ + aisthēsis ‘sensation’.

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