出典:Wiktionary
From Middle English, circa 1300, from Old French plentiveus (“fertile, rich”) (early 13th century), from plentif (“abundant”), from plenté (“abundance”)[1] (Modern French pleinté, English plenty), from Latin plenitatem, accusative of plenitas (“fullness”), from plenus (“complete, full”), from Proto-Indo-European *pl̥h₁nós (“full”).
plenteous (comparative more plenteous, superlative most plenteous)