Definition of friesian:
(n) :
A breed of black and white dairy cattle; any individual cow of that breed.
(n) :
A black breed of horse.
(adj) :
Of or relating to the work of Swedish mycologist and botanist Elias Magnus Fries, who described and assigned botanical names to hundreds of fungus and lichen species.
(adj) :
Alternative form of Frisian. [Of, in or relating to the Frisian language or a Frisian language.]