Where does “plous” come from?

plous (Proto-Italic) comes from Proto-Indo-European pleh₁- — to fill.

Ancestry of “plous”, step by step

plous traces back through two separate lines of ancestry.

via Proto-Indo-European pleh₁-

StepLanguageWordMeaning
1Proto-Indo-Europeanpleh₁-to fill

via Proto-Indo-European pelh₁u-

StepLanguageWordMeaning
1Proto-Indo-Europeanpelh₁u-many
Every word from Proto-Indo-European pleh₁-