1846, "insensible," from Greek anaisthetos "insensate, without feeling; senseless, stupid" (see anaesthesia). Noun meaning "agent that produces anesthesia" first used in modern sense 1848 by Scottish doctor James Young Simpson (1811-1870), discoverer of the surgical uses of chloroform.
1. The operation is carried out under a general anaesthetic.
2. In those days, dentistry was basic. Extractions were carried out without anaesthetic.
3. How long will I be under the anaesthetic ?
4. The anaesthetist gave the patient an anaesthetic.