Source : Webster's Revised Unabridged Dictionary (1913)

Filaria \Fi*la"ri*a\, n. [NL., fr. L. filum a thread.]
   (Zo["o]l.)
   A genus of slender, nematode worms of many species, parasitic
   in various animals. See {Guinea worm}.

Source : WordNet®

filaria
     n 1: European weed naturalized in southwestern United States and
          Mexico having reddish decumbent stems with small
          fernlike leaves and small deep reddish-lavender flowers
          followed by slender fruits that stick straight up; often
          grown for forage [syn: {redstem storksbill}, {alfilaria},
           {alfileria}, {filaree}, {clocks}, {pin grass}, {pin
          clover}, {Erodium cicutarium}]
     2: slender threadlike roundworms living in the blood and
        tissues of vertebrates; transmitted as larvae by biting
        insects
     [also: {filariiae} (pl)]