as·ca·rid 
(ăskə-rĭd)
(ăskə-rĭd)n.
Any of various nematode worms of the order Ascaridida, especially those in the superfamily Ascaridoidea, including the common intestinal parasite Ascaris lumbricoides.
[ Sing. of ascarides, intestinal worms, from Middle English, from Medieval Latin ascaridēs, pl. of ascaris, from Greek askaris.]