Definition of: nemathelminth

(nem′ə·thel′minth) noun
One of a phylum or class (Nemathelminthes) of worms having a threadlike, unsegmented body with papillae or spines at the anterior extremity, as the nematodes and acanthocephalans; the roundworms.
—adjective Pertaining to these worms. Also nem′a.tel′minth (-tel′-). [<NL <Gk. nēma, -atos thread + helmins a worm]