Etymology
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Words related to anesthesia

an- (1)
privative prefix, from Greek an-, "not, without," from PIE root *ne- "not"). The Greek prefix is a fuller form of the one represented in English by a- (3).
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*au- 
Proto-Indo-European root meaning "to perceive."

It forms all or part of: aesthete; aesthetic; anesthesia; audible; audience; audio; audio-; audit; audition; auditor; auditorium; auditory; hyperaesthesia; kinesthetic; oyer; oyez; obedient; obey; paraesthesia; synaesthesia.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit avih, Avestan avish "openly, evidently;" Greek aisthanesthai "to feel;" Latin audire "to hear;" Old Church Slavonic javiti "to reveal."
-ia 
word-forming element in names of countries, diseases, and flowers, from Latin and Greek -ia, noun ending, in Greek especially used in forming abstract nouns (typically of feminine gender); see -a (1). The classical suffix in its usual evolution (via French -ie) comes to Modern English as -y (as in familia/family, also -logy, -graphy). Compare -cy.

In paraphernalia, Mammalia, regalia, etc. it represents Latin or Greek -a (see -a (2)), plural suffix of nouns in -ium (Latin) or -ion (Greek), with formative or euphonic -i-.
anaesthesia (n.)
alternative spelling of anesthesia (q.v.). See æ (1).
anesthesiology (n.)

1908, from anesthesia + -ology.

Anesthesiology. This is the new term adopted by the University of Illinois defining "the science that treats of the means and methods of producing in man or animal various degrees of insensibility with or without hypnosis." [Medical Herald, January, 1912]
anesthetic (adj.)
1846, "insensible;" 1847, "producing temporary loss of sensation," with -ic + Latinized form of Greek anaisthetos "insensate, without feeling; senseless, tactless, stupid" (see anesthesia). Noun meaning "agent that produces anesthesia" first used in modern sense 1848 by Scottish doctor James Young Simpson (1811-1870), pioneer in the surgical use of chloroform.
anesthetist (n.)
"one who administers anesthetics," 1861, from stem of anesthesia + -ist.
anesthetize (v.)
"bring under the influence of an anesthetic," 1848, from Latinized form of Greek anaisthetos "insensate, without feeling" (see anesthesia) + -ize. Related: Anesthetized; anesthetizing; anesthetization.
kinesthesia (n.)

also kinaesthesia, "the sense of muscular movement," 1888, Modern Latin compound of elements from Greek kinein "to set in motion; to move" (from PIE root *keie- "to set in motion") + aisthēsis "perception" (see anesthesia). Earlier was kinaesthesis (1880).