1. A mass of fluid, especially of a liquid, having a whirling or circular motion tending to form a cavity or vacuum in the center of the circle, and to draw in towards the center bodies subject to its action; the form assumed by a fluid in such motion; a whirlpool; an eddy.

2. (Cartesian System)

Defn: A supposed collection of particles of very subtile matter, endowed with a rapid rotary motion around an axis which was also the axis of a sun or a planet. Descartes attempted to account for the formation of the universe, and the movements of the bodies composing it, by a theory of vortices.

3. (Zoöl.)

Defn: 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 structure of the chemical atom. — Vortex wheel, a kind of turbine.

VORTEX FILAMENT
Vor"tex fil"a*ment.

Defn: A vortex tube of infinitesimal cross section.

VORTEX FRINGE
Vor"tex fringe.

Defn: The region immediately surrounding a disk moving flatwise through air; — so called because the air has a cyclic motion as in vortex ring.

VORTEX LINE
Vortex line.