depressor

nouns

any skeletal muscle that draws a body part down

is derived from

any nerve whose activity tends to reduce the activity or tone of the body part it serves

a device used by physician to press a part down or aside

depressor

is derived from

is a type of (narrower)

an instrumentality invented for a particular purpose

"the device is small enough to wear on your wrist"; "a device intended to conserve water"