noun
gyroscope
JYE-ruh-skohp/ˈdʒaɪrəskəʊp/
A device that uses a spinning wheel to measure or maintain orientation.
The gyroscope's central rotor spins inside two perpendicular rings on its stand.

Etymology
The “circle-watcher” was named for its ability to demonstrate Earth's rotation. Its spinning wheel also makes it useful for measuring or maintaining orientation.
In context
… a gyroscope mounted so as to sense rotation of the Earth and from that the alignment of the meridian.
More examples
- A spinning gyroscope resists changes in its orientation.
- The students tilt the frame while the gyroscope keeps spinning.
- Large gyroscopes help keep the ship steady in rough seas.
Forms
gyroscope · gyroscopes
gyroscopic adjective — Relating to a gyroscope or its operation.
Similar words
- gyro
- A shortened name for the same spinning orientation device.