Compensator
Pronunciation : Com"pen*sa`tor
Part of Speech : n.
Definition : 1. One who, or that which, compensates; -- a name applied to various mechanical devices.
2. (Naut.)
Defn: An iron plate or magnet placed near the compass on iron vessels to neutralize the effect of the ship's attraction on the needle.
Source : Webster's Unabridged Dictionary, 1913