Etymology
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gyroscope (n.)

heavy rotating wheel with an axis free to turn in any direction, 1853, improved and named in French 1852 by Foucault, from Greek gyros "a circle" (see gyre (n.)) + skopos "watcher" (from PIE root *spek- "to observe"), because the device demonstrates that the earth rotates.

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Definitions of gyroscope

gyroscope (n.)
rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction;
Synonyms: gyro
From wordnet.princeton.edu