D defs.my
Entry 2 senses Webster, 1913

Depressor

· De·press·or · IPA /dɪˈpɹɛ.sə(ɹ)/
01 n. One who, or that which, presses down; an oppressor.
  1. 1.
    One who, or that which, presses down; an oppressor.
  2. 2.
    A muscle that depresses or tends to draw down a part.(Anat.)
Phrases & compounds
Depressor nerve — a nerve which lowers the activity of an organ; as, the depressor nerve of the heart.