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2 definitions found
 for Center of gyration
From The Collaborative International Dictionary of English v.0.48 :

  Gyration \Gy*ra"tion\ (j[-i]*r[=a]"sh[u^]n), n.
     1. The act of turning or whirling, as around a fixed center;
        a circular or spiral motion; motion about an axis;
        rotation; revolution.
        [1913 Webster]
              The gyrations of an ascending balloon. --De Quincey.
        [1913 Webster]
              If a burning coal be nimbly moved round in a circle,
              with gyrations continually repeated, the whole
              circle will appear like fire.         --Sir I.
        [1913 Webster]
     2. (Zool.) One of the whorls of a spiral univalve shell.
        [1913 Webster]
     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.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  center \cen"ter\ (s[e^]n"t[~e]r), n. [F. centre, fr. L. centrum,
     fr. Gr. ke`ntron any sharp point, the point round which a
     circle is described, fr. kentei^n to prick, goad.]
     1. A point equally distant from the extremities of a line,
        figure, or body, or from all parts of the circumference of
        a circle; the middle point or place.
        [1913 Webster]
     2. The middle or central portion of anything.
        [1913 Webster]
     3. A principal or important point of concentration; the
        nucleus around which things are gathered or to which they
        tend; an object of attention, action, or force; as, a
        center of attaction.
        [1913 Webster]
     4. The earth. [Obs.] --Shak.
        [1913 Webster]
     5. Those members of a legislative assembly (as in France) who
        support the existing government. They sit in the middle of
        the legislative chamber, opposite the presiding officer,
        between the conservatives or monarchists, who sit on the
        right of the speaker, and the radicals or advanced
        republicans who occupy the seats on his left, See Right,
        and Left.
        [1913 Webster]
     6. (Arch.) A temporary structure upon which the materials of
        a vault or arch are supported in position until the work
        becomes self-supporting.
        [1913 Webster]
     7. (Mech.)
        (a) One of the two conical steel pins, in a lathe, etc.,
            upon which the work is held, and about which it
        (b) A conical recess, or indentation, in the end of a
            shaft or other work, to receive the point of a center,
            on which the work can turn, as in a lathe.
            [1913 Webster]
     Note: In a lathe the
     live center is in the spindle of the head stock; the
     dead center is on the tail stock.
     Planer centers are stocks carrying centers, when the object
        to be planed must be turned on its axis.
        [1913 Webster]
     Center of an army, the body or troops occupying the place
        in the line between the wings.
     Center of a curve or Center of a surface (Geom.)
        (a) A point such that every line drawn through the point
            and terminated by the curve or surface is bisected at
            the point.
        (b) The fixed point of reference in polar coordinates. See
     Center of curvature of a curve (Geom.), the center of that
        circle which has at any given point of the curve closer
        contact with the curve than has any other circle whatever.
        See Circle.
     Center of a fleet, the division or column between the van
        and rear, or between the weather division and the lee.
     Center of gravity (Mech.), that point of a body about which
        all its parts can be balanced, or which being supported,
        the whole body will remain at rest, though acted upon by
     Center of gyration (Mech.), that point in a rotating body
        at which the whole mass might be concentrated
        (theoretically) without altering the resistance of the
        intertia of the body to angular acceleration or
     Center of inertia (Mech.), the center of gravity of a body
        or system of bodies.
     Center of motion, the point which remains at rest, while
        all the other parts of a body move round it.
     Center of oscillation, the point at which, if the whole
        matter of a suspended body were collected, the time of
        oscillation would be the same as it is in the actual form
        and state of the body.
     Center of percussion, that point in a body moving about a
        fixed axis at which it may strike an obstacle without
        communicating a shock to the axis.
     Center of pressure (Hydros.), that point in a surface
        pressed by a fluid, at which, if a force equal to the
        whole pressure and in the same line be applied in a
        contrary direction, it will balance or counteract the
        whole pressure of the fluid.
        [1913 Webster] Center

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