Etymology
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Pulex

genus of the flea family, Modern Latin (Linnaeus, 1735), from Latin pulex "flea," from PIE*plou- "flea" (source also of Sanskrit plusih, Greek psylla, Old Church Slavonic blucha, Lithuanian blusa, Armenian lu "flea"). 

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Definitions of Pulex

Pulex (n.)
type genus of the Pulicidae;
Synonyms: genus Pulex
From wordnet.princeton.edu