gyrostabilizer
noun
gy·ro·sta·bi·liz·er
ˌjī-rō-ˈstā-bə-ˌlī-zər
variants
or gyrostat
: a stabilizing device (as for a ship or airplane) that consists of a continuously driven gyro spinning about a vertical axis and pivoted so that its axis of spin may be tipped fore-and-aft in the vertical plane and that serves to oppose sideways motion
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Merriam-Webster unabridged
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