*gyro*

n. 1. 1 a genus comprising the orange tortrix.
Syn. -- genus Argyrotaenia. [ WordNet 1.5 ]

n. 1. 1 a small genus of Hawaiian spreading and rosette-forming shrubs.
Syn. -- genus Argyroxiphium. [ WordNet 1.5 ]

n. an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller.
Syn. -- autogiro, gryoplane [ WordNet 1.5 ]

‖n. [ NL., fr. Gr. gyro`s round + 'odoy`s tooth. ] (Paleon.) A genus of extinct oölitic fishes, having rounded teeth in several rows adapted for crushing. [ 1913 Webster ]

n. [ Gr. gy^ros circle, ring + go`nos fruit. ] (Paleon.) The petrified fruit of the Chara hispida, a species of stonewort. See Stonewort. Lyell. [ 1913 Webster ]

a. [ Gr. gy^ros circle + -oid + -al. ] 1. Spiral in arrangement or action. [ 1913 Webster ]

2. (Crystallog.) Having the planes arranged spirally, so that they incline all to the right (or left) of a vertical line; -- said of certain hemihedral forms. [ 1913 Webster ]

3. (Opt.) Turning the plane of polarization circularly or spirally to the right or left. [ 1913 Webster ]

‖n. [ NL., fr. Gr. gyro`s round + lepi`s scale. ] (Paleon.) A genus of ganoid fishes, found in strata of the new red sandstone, and the lias bone beds. Agassiz. [ 1913 Webster ]

‖n. [ NL., fr. Gr. gyroy^n to round, bend, fr. gyro`s round. ] A turning round. [ R. ] [ 1913 Webster ]

n. [ Gr. gy^ros ring, circle + -mancy: cf. F. gyromancie. ] A kind of divination performed by drawing a ring or circle, and walking in or around it. Brande & C. [ 1913 Webster ]

n. [ F. giron; of German origin. See Gore a piece of cloth. ] (Her.) A subordinary of triangular form having one of its angles at the fess point and the opposite side at the edge of the escutcheon. When there is only one gyron on the shield it is bounded by two lines drawn from the fess point, one horizontally to the dexter side, and one to the dexter chief corner. [ 1913 Webster ]

a. [ F. gironné. ] (Her.) Covered with gyrons, or divided so as to form several gyrons; -- said of an escutcheon. [ 1913 Webster ]

n. [ L. gyrare to revolve + E. pigeon. ] A flying object simulating a pigeon in flight, when projected from a spring trap. It is used as a flying target in shooting matches. Knight. [ 1913 Webster ]

n. [ Gr. gy^ros ring, circle + -scope. ] 1. A rotating wheel, mounted in a ring or rings, for illustrating the dynamics of rotating bodies, the composition of rotations, etc. It was devised by Professor W. R. Johnson, in 1832, by whom it was called the rotascope. [ 1913 Webster ]

2. A form of the above apparatus, invented by M. Foucault, mounted so delicately as to render visible the rotation of the earth, through the tendency of the rotating wheel to preserve a constant plane of rotation, independently of the earth's motion. [ 1913 Webster ]

a. Pertaining to the gyroscope; resembling the motion of the gyroscope. [ 1913 Webster ]

a. [ See Gyre. ] (Bot.) Turned round like a crook, or bent to and fro. Loudon. [ 1913 Webster ]

n. [ Gr. gy^ros ring, circle + "ista`nai to cause to stand.] (Physics) A modification of the gyroscope, consisting essentially of a fly wheel fixed inside a rigid case to which is attached a thin flange of metal for supporting the instrument. It is used in studying the dynamics of rotating bodies. [1913 Webster]

a. (Physics) Of or pertaining to the gyrostat or to gyrostatics. [ 1913 Webster ]