gyro-, gyr- +

(Greek: turning, spinning, whirling, bend, circular motion; originally, "circle, curved, ring")

autogyro, autogiro
1. An aircraft powered by a conventional propeller and supported in flight by a freewheeling, horizontal rotor that provides lift.
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the fuselage that provides lift for the machine, with forward propulsion being provided by a conventional propeller: superseded in most applications by the helicopter.
dextrogyral
Turning the plane of polarization, or rays of light, to the right.
dextrogyrate, dextrogyrating
Turning to the right.
dextrogyration
1. Turning to the right or motion to the right; said of movements of the eyes and of the plane of polarization.
2. Turning to the right, as the rotation to the right of the plane of polarization of light in certain crystals and the like.
gyral
A reference to a gyrus.
gyrate
Twisted or coiled; convoluted (coiled or folded or caused to coil or fold in overlapping whorls).
gyration
1. The act of gyrating; circular or spiral motion; revolution; rotation; whirling.
2. A single complete turn (axial or orbital)>
3. The act of rotating in a circle or spiral.
gyre, gyres
1. A round shape formed by a series of concentric circles.
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.

gyrectomy
1. Excision of a convolution (fold, twist, or coil of the brain), or gyrus (convolution on the surface of the cerebral hemisphere), of the cerebrum.
2. Excision or resection of a cerebral gyrus, or of a portion of the cerebral cortex.
gyrencephalic
Referring to the presence of convolutions in the cerebral cortex.
gyro, gyros
1. A rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction.
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.

gyrocompass; gyrostatic compass
1. A compass that contains a gyroscope which is kept level so that it orients itself with "true north".
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.
gyrocopter
An aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller.

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.

gyrodus
A genus of extinct oolitic fish, having rounded teeth in several rows which were adapted for crushing.
gyrograph
An instrument for recording revolutions or whirling rotations.

Related "around, round, surrounding" units: ambi-; ampho-; circ-; circum-; cyclo-, -cycle; peri-.

Inter-related cross references involving word units meaning "bend, curve, turn": diversi-; diverticul-; flect-, flex-; meand-; -plex; streph-; stroph-; tors-; tropo-; verg-; vers-; volv-.