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Medical Definition of Secernentia
1. 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. See: Adenophorasida. Synonym: Phasmidia, Secernentia. Origin: L. Secerno, to separate, hide (05 Mar 2000)