A genus of nematodes commonly called seatworms or pinworms (although the pinworm of humans is the closely related form, Enterobius vermicularis). Oxyuris equi, the horse pinworm, is a common parasite of horses in all parts of the world, inhabiting the large intestine.
[G. oxys, sharp, + oura, tail]
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Examples: glitazone, GI cocktail, etc.