
• (n.) One who, or that which, compensates; -- a name applied to various mechanical devices. • (n.) An iron plate or magnet placed near the compass on iron vessels to neutralize the effect of the ship`s attraction on the needle.
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http://thinkexist.com/dictionary/meaning/compensator/

a device used to accommodate oil or compound expansion in the sealing ends
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=461-12-03
Com'pen·sa`tor noun 1. One who, or that which, compensates; -- a name applied to various mechanical devices.
2. (Nautical) An iron plate or magnet placed near the compass on iron vessels to neutralize the effect of the ship's attraction on the needle.
Found on
http://www.encyclo.co.uk/webster/C/121

In firearms, a compensator is a device which is attached to the muzzle of automatic weapons to reduce the tendency of such weapons to rise at the muzzle when being fired in full automatic mode. The compensator directs some of the muzzle blast upwards, thereby forcing the muzzle down and compensating for some of the upward tendency of the weapon.
Found on
http://www.probertencyclopaedia.com/browse/FC.HTM
No exact match found.