| ascaris | <organism> A genus of nematode worms, including the species of roundworm that can infect the intestines of humans and swine. Members of this genus resemble earthworms and have three-lipped mouths. (09 Oct 1997) |
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| Ascaris equorum | A large heavy-bodied ascarid nematode extremely common in the small intestine of horses and other equids. Larvae may develop in man or mice, but do not reach the adult stage. Synonym: Ascaris equorum. (05 Mar 2000) |
| Ascaris lumbricoides | <organism> A parasitic gut dwelling nematode worm, of major medical significance, used in developmental studies. (18 Nov 1997) |
| ascaris suum | A species of parasitic nematode usually found in domestic pigs and a few other animals. Human infection can also occur, presumably as result of handling pig manure, and can lead to intestinal obstruction. (12 Dec 1998) |