Definition of gyrostabilizer
: 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 —called also gy*ro*stat play \ˈjī-rə-ˌstat\
First Known Use of gyrostabilizer
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