The definition of anesthesia is a partial or total loss of feeling or sensation, particular to pain.(noun)
An example of anesthesia is the state a person is in after being given Novocaine for a dental procedure.
See anesthesia in Webster's New World College Dictionary
Origin: ModL < Gr anaisthēsia < an-, without + aisthēsis, feeling < aisthanesthai: see aesthetic
See anesthesia in American Heritage Dictionary 4
Origin: New Latin anaesthēsia
Origin: , from Greek anaisthēsiā, insensibility
Origin: : an-, without; see a-1
Origin: + aisthēsis, feeling (from aisthanesthai, aisthē-, to feel; see au- in Indo-European roots). Word History: The following passage, written on November 21, 1846, by Oliver Wendell Holmes, a physician-poet and the father of the Supreme Court justice of the same name, allows us to pinpoint the entry of anesthesia and anesthetic into English: “Every body wants to have a hand in a great discovery. All I will do is to give you a hint or two as to names—or the name—to be applied to the state produced and the agent. The state should, I think, be called ‘Anaesthesia’ [from the Greek word anaisthēsia, “lack of sensation”]. This signifies insensibility᠁ The adjective will be ‘Anaesthetic.’ Thus we might say the state of Anaesthesia, or the anaesthetic state.” This citation is taken from a letter to William Thomas Green Morton, who in October of that year had successfully demonstrated the use of ether at Massachusetts General Hospital in Boston. Although anaesthesia is recorded in Nathan Bailey's Universal Etymological English Dictionary in 1721, it is clear that Holmes really was responsible for its entry into the language. The Oxford English Dictionary has several citations for anesthesia and anesthetic in 1847 and 1848, indicating that the words gained rapid acceptance.
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