The definition of a stethoscope is a medical instrument with earphones and a tube with a flat metal disk at the end, that a doctor uses to listen to a patient's heart and lungs.(noun)
An example of a stethoscope is what a doctor uses to listen for fluid in a patient's lungs.
See stethoscope in Webster's New World College Dictionary
Origin: Fr stéthoscope: see stetho- & -scope
See stethoscope in American Heritage Dictionary 4
Origin: French stéthoscope
Origin: : Greek stēthos, chest
Origin: + French -scope, an instrument for viewing (from Latin -scopium; see -scope).
Learn more about stethoscope