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Portuguese word pulga comes from Proto-Indo-European *pusl-, and later Latin pulex (Flea.).

Pulga etymology ?

Pulga detailed word origin explanation

Dictionary entryLanguageDefinition
*pusl- Proto-Indo-European (ine-pro)
pulicis Spanish (spa)
pulex Latin (lat) Flea.
*pulica Vulgar Latin (la-vul)
pulga Portuguese (por) Flea (parasitic insect).