steth·o·scope 
(stĕthə-skōp′)
(stĕthə-skōp′)n.
Any of various instruments used for listening to sounds produced within the body.
[French stéthoscope : Greek stēthos, chest + French -scope, an instrument for viewing (from Latin -scopium; see -SCOPE).]
steth′o·scopic (-skŏpĭk), steth′o·scopi·cal (-ĭ-kəl) adj.
steth′o·scopi·cal·ly adv.
ste·thosco·py (stĕ-thŏskə-pē) n.
stethoscope