[aerohead]

Originally Posted by Piwoslaw

Sorry for any mistakes in my translation. The original in Piechna's book is wiry krawędziowe. I found that phrase in a Polish Wikipedia article on lift:

Google translates the above as:

Since the English version of that Wikipedia article is totally different, I could not find anything discribed in the exact same way.
Another phrase I found that may be suitable is tip vortex(?).
Looks like my understanding of vortices leaves much to be desired.

Perhaps the 'edge' is any sharp ( relatively )longitudinal intersection,such as roof-to-side,side-to-belly,etc.,where flows of dissimilar direction and velocity meet and roll up into a vortex.
The term is almost more useful to us in that context,as with cars,we don't really have 'tips.'
Spanwise vorticity,as over a boot/trunklid or pickup bed would be defined by the edges of the roof header-trunklid or roof header -tailgate.