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onia flabellum), sea plume (G. setosa), and other allied species having a flexible, horny axis.

pal divisions of Alcyonaria, including those forms which have a firm and usually branched axis, covered with a porous crust, or c

rof. James Gregory, of Edinburgh, who perfected it in 1663. A small concave mirror in the axis of this telescope, having its focus coincident with that of the large reflector, transmits the light received from the latter back through a hole in its center to the eyepiece placed behind it. -- Gregorian year, the year as…

To revolve round a central point; to move spirally about an axis, as a tornado; to revolve.

rning or whirling, as around a fixed center; a circular or spiral motion; motion about an axis; rotation; revolution. The gyrations of an ascending balloon. De Quincey. If a burning coal be nimbly moved round in a circle, with gyrations continually repeated, the whole circle will appear like fire. Sir I. Newton.…

, in which the resistance and the actuating force are on opposite sides of the fulcrum or axis.

which the resistance and the actuating force are both on the same side of the fulcrum or axis.

Same as Homotaxis.

Relating to homotaxis.

Same as Homotaxis.

ich a gun will throw a projectile. -- Horizontal water wheel, a water wheel in which the axis is vertical, the buckets or floats revolving in a horizontal plane, as in most turbines.

Beneath the axis of the skeleton; subvertebral; hyposkeletal.

n hyperbola revolving about one of its axes. The surface has two separate sheets when the axis of revolution is the transverse axis, but only one when the axis of revolution is the conjugate axis of the hyperbola.

Bending gradually toward the axis or center, as branches or petals.

Having the edges bent abruptly toward the axis; -- said of the parts of the calyx or corolla in æstivation.

Bent or turned abruptly inwards, or toward the axis, as the petals of a flower.

lowering, or the general arrangement and disposition of the flowers with reference to the axis, and to each other.

f rotation in the plane, is the point which for the instant is at rest. -- Instantaneous axis of rotation (Kinematics), in a body which has motions both of translation and rotation, is a line, which is supposed to be rigidly united with the body, and which for the instant is at rest. The motion of the body is for the…

Situated in an interaxis. Gwilt.

erging polarized light; thus, a section of a uniaxial crystal, cut normal to the vertical axis, shows a series of concentric colored rings with a single black cross; -- so called because produced by the interference of luminous waves. -- Interference fringe. (Optics) See Fringe.