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ectozoon

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WordReference Random House Unabridged Dictionary of American English © 2026

ec•to•zo•on n., pl. -zo•a [Biol.]

Microbiologyany animal parasite, as the louse, that lives on the surface of its host (opposed to entozoon).

Also, ectozoan.

ecto- + -zoon 1855–60

'ectozoon' also found in these entries (note: many are not synonyms or translations):

ectozoan - entozoon - epizoon

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