vortex

Short definition from Wiktionary

Noun

1. 1
   A whirlwind, whirlpool, or similarly moving matter in the form of a spiral or column.
2. 2
   Anything that involves constant violent or chaotic activity around some centre.
3. 3
   Anything that inevitably draws surrounding things into its current.
4. 4
   A supposed collection of particles of very subtle matter, endowed with a rapid rotary motion around an axis which was also the axis of a sun or planet; part of a Cartesian theory accounting for the formation of the universe, and the movements of the bodies composing it.
5. 5
   Any of numerous species of small Turbellaria belonging to Vortex and allied genera.

Verb

1. 1
   To mix using a vortex mixer.