What is "filanders"

Filanders \Fil"an*ders\, n. pl. [F. filandres, fr. L. filum thread.] (Falconry) A disease in hawks, characterized by the presence of small threadlike worms, also of filaments of coagulated blood, from the rupture of a vein; -- called also backworm.
--Sir T. Browne.

n. (context falconry English) A disease in hawks, characterized by the presence of small thread-like worms and of filaments of coagulated blood, from the rupture of a vein.