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Webster's Dictionary (1865)

De-prĕss'or, n.

noun

n. [It. depressore, Sp. depresor.]

  1. One who presses down; an oppressor.
  2. (Anat.) A muscle that depresses or draws down the part to which it is attached; as, the depressor of the lower jaw or of the eyeball;—called also depriment or deprimens.