Definition: A class of nematodes possessing lateral canals opening into the excretory system and phasmids; it includes most of the familiar nematode parasites of humans and domestic animals, including the soil-borne nematodes, strongyles, and filiariae.
[L. secerno, to separate, hide]
See Also: Adenophorasida
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Examples: glitazone, GI cocktail, etc.