Plural of entozoan; multiple parasitic animals that live within the bodies of hosts.
From Greek 'entos' (inside) and 'zoon' (animal), with English plural '-s'. The term directly translates to 'inside-animals' and has maintained this meaning for centuries.
When scientists discovered that multiple parasitic worms could infect a single animal, they needed to call them 'entozoans'—it's basically the most straightforward name: animals living inside.
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