| nemalite | <chemical> A fibrous variety of brucite. Origin: Gr. Thread: cf. F. Nemalite. Source: Websters Dictionary (01 Mar 1998) |
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| nematelmia | <zoology> Same as Nemathelminthes. Source: Websters Dictionary (01 Mar 1998) |
| nematelminthes | <zoology> An ordr of helminths, including the Nematoidea and Gordiacea; the roundworms. Alternative forms: Nematelminthea. Origin: NL. See Nemato-, and Helminthes. Source: Websters Dictionary (01 Mar 1998) |
| nemathecium | Origin: NL, fr. Gr. A thread + a box. <botany> A peculiar kind of fructification on certain red algae, consisting of an external mass of filaments at length separating into tetraspores. Source: Websters Dictionary (01 Mar 1998) |
| nemathelminth | A member of the former phylum Nemathelminthes. (05 Mar 2000) |
| Nemathelminthes | Formerly considered a phylum to incorporate the pseudocelomate organisms, which now are divided into the distinct phyla Acanthocephala, Entoprocta, Rotifera, Gastrotricha, Kinorhyncha, Nematoda, and Nematomorpha. Origin: nemat-+ G. Helmins, helminthos, worm (05 Mar 2000) |
| nematization | Infestation by nematodes. (05 Mar 2000) |
| nematoblast | <biology> A spermatocyte or spermoblast. Source: Websters Dictionary (01 Mar 1998) |
| nematocalyx | Origin: NL. See Nemato-, and Calyx. <zoology> One of a peculiar kind of cups, or calicles, found upon hydroids of the family Plumularidae. They contain nematocysts. See Plumularia. Source: Websters Dictionary (01 Mar 1998) |
| nematocera | <zoology> A suborder of dipterous insects, having long antennae, as the mosquito, gnat, and crane fly. Synonym: Nemocera. Origin: NL, fr. Gr, a thread + horn. Source: Websters Dictionary (01 Mar 1998) |
| nematocidal | Destructive to nematode worms. (05 Mar 2000) |
| nematocide | An agent that kills nematodes. Origin: nematode + L. Caedo, to kill (05 Mar 2000) |
| nematocyst | Stinging mechanism used for defence and prey capture by Hydra and other members of the Cnidaria (Coelenterata). It is located within a specialised cell, the nematocyte and consists of a capsule containing a coiled tube. When the nematocyte is triggered, the wall of the capsule changes its water permeability and the inrush of water causes the tube to evert explosively ejecting the nematocyst from the cell. The tube is commonly armed with barbs and may also contain toxin. (18 Nov 1997) |
| nematocyte | Stinging cells found in Hydra, used for capturing prey and for defence. There are four major types, containing different sorts of nematocysts: stenoteles (60%), desmonemes, holotrichous isorhizas and atrichous isorhizas. They differentiate from interstitial cells and are almost all found in the tentacles. (18 Nov 1997) |
| nematoda | A class of unsegmented helminths with fundamental bilateral symmetry and secondary triradiate symmetry of the oral and oesophageal structures. Many species are parasites. (12 Dec 1998) |