| Word | Definitions | Synonyms |
|---|---|---|
| cestode | (noun) ribbonlike flatworms that are parasitic in the intestines of humans and other vertebrates | Synonyms: tapeworm |
| nematode | (noun) unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic | Synonyms: nematode worm, roundworm |
| pentode | (noun) a thermionic tube having five electrodes | - |
| trematode | (noun) parasitic flatworms having external suckers for attaching to a host | Synonyms: fluke, trematode worm |