Center of gyration. (Mech.) See under Center. -- Radius of gyration,
the distance between the axis of a rotating body and its center of
gyration. Rankine.
Gy"ra*to*ry (j"r*t*r), a. Moving in a circle, or spirally; revolving;
whirling around.
Gyre (jr), n. [L. gyrus, Gr. gy^ros, cf. gyro`s round.] A circular
motion, or a circle described by a moving body; a turn or revolution; a
circuit.
Quick and more quick he spins in giddy gyres.
Dryden.
Still expanding and ascending gyres.
Mrs. Browning.
Gyre, v. t. & i. [Cf. OF. gyrer, girer. See Gyrate.] To turn round; to
gyrate. [Obs.] Bp. Hall. Drayton.