an‧aes‧thet‧ic also anesthetic American English [uncountable and countable]
a drug that stops you feeling pain
The operation will have to be done under anaesthetic (=using anaesthetic).
Eye surgery is often performed using a local anaesthetic (=one that only affects a particular area of your body).
You will need to have a general anaesthetic (=one that makes you completely unconscious).
—anaesthetic adjective [only before noun]