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
From the M-W Editors
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Origin and Etymology of argulus
New Latin, from Argus, mythological being + New Latin -ulus
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