gy ‧ ro ‧ scope /ˈdʒaɪrəskəʊp $ -skoʊp/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: French ; Origin: Greek gyros 'ring, circle' ; because it was originally used to show how the Earth turns ]
a wheel that spins inside a frame and is used for keeping ships and aircraft steady. It can also be a child’s toy.
—gyroscopic /ˌdʒaɪrəˈskɒpɪk◂ $ -ˈskɑː-/ adjective