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Any one of numerous species of small Turbellaria belonging to Vortex and allied genera. See Illustration in Appendix. Vortex atom (Chem.), a hypothetical ring-shaped mass of elementary matter in continuous vortical motion. It is conveniently regarded in certain mathematical speculations as the typical form and structur…

A vortex tube of infinitesimal cross section.

disk moving flatwise through air; -- so called because the air has a cyclic motion as in vortex ring.

A line, within a rotating fluid, whose tangent at every point is the instantaneous axis of rotation as that point of the fluid.

A ring-shaped mass of moving fluid which, by virtue of its motion of rotation around an axis disposed in circular form, attains a more or less distinct separation from the surrounding medium and has many of the properties of a solid.

) of a homogeneous, incompressible, frictionless fluid. Various properties of such atoms (vortex atoms) can be mathematically deduced.

An imaginary tube within a rotating fluid, formed by drawing the vortex lines through all points of a closed curve.

A whirl; a vortex. Spectator.

Of or pertaining to a vortex or vortexes; resembling a vortex in form or motion; whirling; as, a vortical motion. -- Vor"ti*cal*ly, adv.

tom, a breast wheel when at an intermediate point; other forms are called reaction wheel, vortex wheel, turbine wheel, etc.

An eddy or vortex of water; a place in a body of water where the water moves round in a circle so as to produce a depression or cavity in the center, into which floating objects may be drawn; any body of water having a more or less circular motion caused by its flowing in an irregular channel, by the coming together of…

aracterized by an inward spiral motion of the air with an upward current in the center; a vortex of air. It usually has a rapid progressive motion. The swift dark whirlwind that uproots the woods. And drowns the villages. Bryant.