Anesthesia
Etymology
From Greek “an-” (without) and “aisthēsis” (sensation or perception). The old Greek word for numbness was repurposed in 1846, when the American physician Oliver Wendell Holmes suggested it to name the new ether-induced state after the first public surgical demonstration. So the word is ancient but its medical career is startlingly recent — barely older than photography.
noun · /an-uhs-THEE-zhuh/
A drug-induced loss of sensation — sometimes of one body part, sometimes of consciousness entirely — that lets painful procedures happen without suffering.
What it names
The modern bargain that makes surgery bearable: the deliberate, reversible shutdown of feeling, without which most of medicine as we know it would be impossible.
Example
Because it was only a hand operation, they used a local anesthesia and she watched the whole thing, chatting with the surgeon.
Related idea
Anesthesia removes sensation; an analgesic removes only pain. General anesthesia also removes consciousness, whereas a local anesthesia numbs one region while you stay awake — a distinction worth knowing before any procedure.