D defs.my
Entry 2 senses Webster, 1913

Compensator

· Com·pen·sa·tor · IPA
01 n. One who, or that which, compensates; -- a name applied to various mechanical devices.
  1. 1.
    One who, or that which, compensates; -- a name applied to various mechanical devices.
  2. 2.
    An iron plate or magnet placed near the compass on iron vessels to neutralize the effect of the ship's attraction on the needle.(Naut.)