a class of worms, Modern Latin compound of nemat- "thread" (from Greek nema, genitive nematos "thread," from stem of nein "to spin;" see needle (n.)) + -odes "like, of the nature of" (see -oid).

Online Etymology Dictionary, © 2010 Douglas Harper

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Medicine definitions for nematoda




A phylum of worms including species parasitic in humans and plants as well as free-living nonparasitic species in soil or water. It includes the intestinal roundworms and filarial roundworms.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.