Where does “duoplural” come from?

duoplural (English) comes from English plural, from Middle English plurelle, from Old French plurel, from Latin plūrālis, from Latin plūs, from Old Latin plous, from Proto-Indo-European ploh₁is-.

duoplural (English): Pertaining to grammatical number (as in singular and plural), referring to two or more of something; nonsingular

Definitions

Pertaining to grammatical number (as in singular and plural), referring to two or more of something; nonsingular

Ancestry of “duoplural”, step by step

Step	Language	Word	Meaning
1	English	plural	Consisting of or containing more than one of...
2	Middle English	plurelle	plural
3	Old French	plurel	plural
4	Latin	plūrālis	plural
5	Latin	plūs	more; more of
6	Old Latin	plous	—
7	Proto-Indo-European	ploh₁is-	—

Every word from Proto-Indo-European ploh₁is- →Every word from Old Latin plous →Every word from Latin plūs →