noun
a parasite that lives on the outside of its host
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An ectoparasite is an organism that lives on the outside of its host, such as a tick or louse.
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My dog got infested with ectoparasites after playing in the woods.
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I hate those creepy crawlies that act as ectoparasites on animals.
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Negative thoughts can be like ectoparasites, feeding on your happiness.