Plural of cestode; parasitic flatworms, also called tapeworms, that live in the intestines of animals and humans.
From Latin 'cestus' (belt or girdle) + Greek 'eidos' (form). These parasites were named for their belt-like segmented appearance when observed.
Tapeworms look like long, divided ribbons running through your insides—ancient scientists called them 'cestus' (belt) and that poetic name stuck for thousands of years!
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