Analgesic

adj. pain-killing, pain-reducing, anaesthetic

n. anaesthesia, pain-killer, pain-reducer

An analgesic (colloquially known as a painkiller) is any member of the diverse group of drugs used to relieve pain (achieve analgesia). The word analgesic derives from Greek an- ("without") and -algia ("pain"). Analgesic drugs act in various ways on the peripheral and central nervous systems; they include paracetamol (acetaminophen), the nonsteroidal anti-inflammatory drugs (NSAIDs) such as the salicylates, narcotic drugs such as morphine, synthetic drugs with narcotic properties such as tramadol, and various others. Some other classes of drugs not normally considered analgesics are used to treat neuropathic pain syndromes; these include tricyclic antidepressants and anticonvulsants.
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Analgesic /an·al·ge·sic/ 1. relieving pain. 2. pertaining to analgesia. 3. an agent that relieves pain without causing loss of consciousness. [more]Analgesic - Community and Resources

Noun
1. a medicine used to relieve pain
(synonym) anodyne, painkiller, pain pill
(hypernym) medicine, medication, medicament, medicinal drug
(hyponym) acetaminophen, Datril, Tylenol, Panadol, Phenaphen, Tempra, Anacin III
Adjective
1. capable of relieving pain; "the anodyne properties of certain drugs"; "an analgesic effect"
(synonym) analgetic, anodyne
(similar) moderating

1
adjective
referring to analgesia
2
noun
painkilling drug which produces analgesia
COMMENT: analgesics are commonly used as local anaesthetics, for example in dentistry