Source : Webster's Revised Unabridged Dictionary (1913)

Filarial \Fi*la"ri*al\, a.
   1. (Zo["o]l. & Med.) Of, pertaining to, or caused by,
      filari[ae] and allied parasitic worms.

   2. Straight, as if in a line; as, the filarial flight of
      birds.

Source : WordNet®

filarial
     adj : related to or infested with of transmitting parasitic worms
           especially filaria