In a manner relating to or characterized by anesthesia; in a way that produces numbness or loss of sensation.
From 'anesthetic' + '-ally' (adverbial suffix). The adverbial form allows description of how anesthetic effects occur or are applied.
When doctors describe something as working 'anesthetically,' they mean it numbs or deadens sensation in that specific way—it's a technical adverb used mainly in medical and scientific writing.
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