Source : Webster's Revised Unabridged Dictionary (1913)

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.