noun

1. gyroscope
2. gyrocompass

noun pl. gyros -·ros

1. a sort of loaf consisting of layers of lamb or lamb and beef, roasted, as on a vertical spit, and sliced
2. a sandwich consisting of slices of this meat, onions, tomatoes, etc. wrapped in a pita

Etymology: < ModGr gyros, a circle (from rotating meat on a spit), wrongly taken as a pl.