• (n.) An instrument for intensifying sounds produced by percussion of the thorax.
Ech'o·scope noun [ Greek ..., ..., sound + -scope .] (Medicine) An instrument for intensifying sounds produced by percussion of the thorax. Knight. 
Type: Term Pronunciation: ek′ō-skōp Definitions: 1. Instrument for displaying echoes by means of ultrasonic pulses on an oscilloscope to demonstrate structures lying at depths within the body.