A parasitic animal organism, especially a worm or protozoan, that lives inside the intestines of a host animal or human.
From Greek 'enteron' (intestine) + 'zoon' (animal) + '-an' (suffix forming adjectives/nouns). The term reflects the systematic classification of parasitic life developed in the 18th century.
The 'zoo-' root meaning 'animal' appears in protozoa, zoology, and zooplankton—linguistically grouping all these crawling, squirming parasitic creatures under one conceptual umbrella of 'living things' distinct from humans.
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