a mass of whirling water, air, etc that tends to form a cavity or vacuum in the centre of the circle, into which material is drawn, esp a whirlpool or whirlwind
a region within a body of fluid in which the fluid is rotating
something that resembles a whirlpool in violent activity or in engulfing or overwhelming
vortical /ʹvawtikl/ adj
vorticity /vawʹtisiti/ noun
[Latin vertex, vortex whirlpool]