'Depressor' definitions:

Definition of 'depressor'

noun

Any skeletal muscle that draws a body part down [syn: depressor, depressor muscle]

noun

Any nerve whose activity tends to reduce the activity or tone of the body part it serves [syn: depressor, depressor nerve]

noun

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

From: GCIDE

Depressor \De*press"or\, n.
1. One who, or that which, presses down; an oppressor. [1913 Webster]
2. (Anat.) A muscle that depresses or tends to draw down a part. [1913 Webster]
Depressor nerve (Physiol.), a nerve which lowers the activity of an organ; as, the depressor nerve of the heart. [1913 Webster]