Where does “rebarbadeira” come from?

rebarbadeira (Portuguese) comes from Portuguese rebarbar, from Portuguese rebarba, from Portuguese barba, from Old Portuguese barba, from Latin barba, from Latin farba, from Proto-Italic farβā, from Proto-Indo-European bʰardʰéh₂ — beard.

rebarbadeira (Portuguese): angle grinder power tool with a perpendicular abrasive disc

Definitions

angle grinder power tool with a perpendicular abrasive disc

Ancestry of “rebarbadeira”, step by step

Step	Language	Word	Meaning
1	Portuguese	rebarbar	to burr, deburr to buy and sell goods
2	Portuguese	rebarba	burr; leftovers
3	Portuguese	barba	beard
4	Old Portuguese	barba	—
5	Latin	barba	beard; wool, down on a plant; Alternative form of...
6	Latin	farba	—
7	Proto-Italic	farβā	beard
8	Proto-Indo-European	bʰardʰéh₂	beard

Every word from Proto-Indo-European bʰardʰéh₂ →Every word from Proto-Italic farβā →Every word from Latin farba →