WordReference Random House Unabridged Dictionary of American English © 2019
aus•cul•ta•tion  (ô′skəl tāshən),USA pronunciation n. 
  1. Medicinethe act of listening, either directly or through a stethoscope or other instrument, to sounds within the body as a method of diagnosis.
  • Latin auscultātiōn- (stem of auscultātiō) a listening, attending to, equivalent. to auscultāt(us) listened to (past participle of auscultāre; aus- (variant stem of auris ear) + -cultā- of uncertain sense and origin, originally + -tus past participle suffix) + -iōn- -ion
  • 1625–35

Collins Concise English Dictionary © HarperCollins Publishers::

auscultation /ˌɔːskəlˈteɪʃən/ n
  1. the diagnostic technique in medicine of listening to the various internal sounds made by the body, usually with the aid of a stethoscope
  2. the act of listening
Etymology: 19th Century: from Latin auscultātiō a listening, from auscultāre to listen attentively; related to Latin auris ear

auscultatory /ɔːˈskʌltətərɪ/, auscultative /ɔːˈskʌltətɪv; ˈɔːskəlˌteɪtɪv/ adj

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