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Analgesia is the loss of sensitivity to pain.
An analgesic is a substance that causes analgesia.
You may be familiar with the term "analgesic" for common pain relievers such as aspirin, ibuprofen, or acetaminophen for example. Be careful not to confuse pain relievers with anesthetics which are used to block pain and other sensations during surgical procedures.
Acute exposure to certain chemicals such as ethyl chloride can induce analgesia among other symptoms.
Complete or partial insensitivity to pain may sound great, but this presents a serious hazard. Imagine having no sensations of pain in your everyday life -- you might not notice that you have put your hand on a hot stove and suffered third degree burns until you smelled the charred flesh. Ugh!
See also: anesthesia, asphyxiant.
Additional definitions from Google and OneLook.
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