Source : Webster's Revised Unabridged Dictionary (1913)

Helminthiasis \Hel`min*thi"a*sis\, n. [NL., fr. Gr. ? to suffer
   from worms, fr. ?, ?, a worm.] (Med.)
   A disease in which worms are present in some part of the
   body.

Source : WordNet®

helminthiasis
     n : infestation of the body with parasitic worms