An Etymological Dictionary of Astronomy and Astrophysics

In fluid mechanics, a measure of the rate of rotational spin in a fluid. Mathematically, vorticity is a vector field defined as the curl of the velocity field:
ω = ∇ x v.
Meteo.: The rotation of air around a vertical axis.

Etymology (EN): From L. vortic-, from → vortex + → -ity.

Etymology (PE): Gerdšârigi, from gerdšâr→ vortex + -igi, → -ity.