
Helminths (s) are large multicellular organisms, which when mature can generally be seen with the naked eye. They are worm-like organisms living in and feeding on living hosts, receiving nourishment and protection while disrupting their hosts` nutrient absorption, causing weakness and disease. Those that live inside the digestive tract are called....
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http://en.wikipedia.org/wiki/Helminths

<epidemiology> Worms, in particular the five groups of parasitic worms: Monogeneans (flukes), Digeneans (flukes, schistosomes), Cestodes (tapeworms), Nematodes (roundworms) and Acanthocephalans (spiny-headed worms). ... (05 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973

Helminths are multi-cellular, often macroscopic worms having both rudimentary organs and organ systems.
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http://www.probertencyclopaedia.com/browse/BH.HTM

Parasitic worms.
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http://www.thehorse.com/Glossary.xhtml?L=H
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