The Collaborative International Dictionary of English v.0.48:

Ascariasis \As`ca*ri"a*sis\, n. [NL., fr. Gr. ? an intestinal
   worm.] (Med.)
   A disease, usually accompanied by colicky pains and diarrhea,
   caused by the presence of ascarids in the gastrointestinal
   canal.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

ascariasis
    n 1: infestation of the human intestine with Ascaris roundworms