A scientist who studies parasitic worms and other organisms that live inside the bodies of animals.
From Greek 'entos' (inside) + 'zoon' (animal) + '-ologist' (one who studies). The term emerged in the 19th century when microscopy allowed scientists to discover and classify internal parasites.
Before germ theory, people had no idea why they got sick from eating undercooked meat—entozoologists eventually revealed the microscopic culprits living in their intestines, revolutionizing food safety and medicine.
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