The Collaborative International Dictionary
Vortex line
Vortex line \Vortex line\ A line, within a rotating fluid, whose tangent at every point is the instantaneous axis of rotation as that point of the fluid.
Usage examples of "vortex line".
The web was fixed to the vortex line array by small, tight rings of webbing which encircled, without quite touching, the glowing spin-singularities.
There must be one site, a specific place where the generator exists to power the vortex line.