A person or device that administers anaesthetic; something that causes anaesthesia.
From 'anaesthetize' + '-er' (a suffix forming nouns meaning one who does something). This can refer either to a person performing the action or a device or drug that produces the effect.
Modern anaesthetizers are incredibly sophisticated—the machines monitor heart rate, blood oxygen, carbon dioxide levels, and deliver precise drug doses measured in milliliters; a human anaesthetist manages the device but the technology does much of the actual regulation.
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