A substance or drug that produces anaesthesia; an anaesthetic agent.
From 'anaesthesia' + '-ant' (a suffix indicating an agent or substance that performs an action). This is a less common variant of 'anaesthetic' as a noun.
Different anaesthesiants work in different ways—some block pain signals in the brain, others prevent signals from reaching the brain, and still others relax muscles; surgeons choose them based on what type of procedure they're performing.
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