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argulus

noun
ar·​gu·​lus | \ˈärgyələs\

Definition of argulus 

1 capitalized : a common genus of fish lice including forms highly destructive to goldfish and related forms

2 plural arguli\ -​ˌlī\ : a fish louse of the genus Argulus : carp louse

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History and Etymology for argulus

New Latin, from Argus, mythological being + New Latin -ulus

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