gyro-, gyr- +
(Greek: turning, spinning, whirling, bend, circular motion; originally, "circle, curved, ring")
2. An aircraft with an unpowered, horizontally rotating propeller on a shaft above the fuselage that provides lift for the machine, with forward propulsion being provided by a conventional propeller: superseded in most applications by the helicopter.
2. Turning to the right, as the rotation to the right of the plane of polarization of light in certain crystals and the like.
2. A single complete turn (axial or orbital)>
3. The act of rotating in a circle or spiral.
2. A circular or spiral form; a vortex.
3. A circular or spiral motion, especially a circular ocean current.
A ringlike system of ocean currents rotating clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.
2. Excision or resection of a cerebral gyrus, or of a portion of the cerebral cortex.
2. A Greek sandwich: sliced roast lamb with onion and tomato stuffed into pita bread.
A sandwich made from roasted lamb, originally the meat itself, as roasted on a rotating spit, from Modern Greek gyros, "a circle". The "s" was mistaken in English for a plural and so it was deleted; therefore, it went from gyros to gyro.
2. A north-seeking form of gyroscope used as a directional reference in navigation.
3. A navigational compass containing a gyroscope rotor, that, when adjusted for the latitude and speed of the vessel or aircraft, indicates the direction of true north along the surface of the earth or communicates this information to one or more gyro repeaters.
An autocopter (autogyro) is a type of rotary wing aircraft supported in flight by lift provided by a rotor. Unlike a helicopter, the rotor of an autogyro is driven by aerodynamic forces alone once it is in flight, and thrust is provided by an engine-powered propeller similar to that of a fixed-wing aircraft. The autogyro is a distinct type of aircraft and not a hybrid between fixed-wing aircraft and helicopters.