chestpiece
Noun
Meaning
chestpiece (plural chestpieces)
A piece of clothing or armour worn on the chest.
Synonyms
Examples
The chestpiece usually consists of two sides that can be placed against the patient for sensing sound; a diaphragm (plastic disc) or bell (hollow cup).
The simplest and least effective method of sound detection is achieved by placing a microphone in the chestpiece.