Where does “roer” come from?

roer (Galician) comes from Old Portuguese roer, from Latin rodere, from Latin rodo, from Proto-Indo-European rōd-, from Proto-Indo-European reh₁d- — to scrape, scratch, gnaw.

roer (Galician): to gnaw, to nibble, to bite; to corrode

Definitions

to gnaw, to nibble, to bite; to corrode

Ancestry of “roer”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	roer	—
2	Latin	rodere	second-person singular future passive indicative...
3	Latin	rodo	I gnaw, nibble, bite; eat or waste away, corrode,...
4	Proto-Indo-European	rōd-	—
5	Proto-Indo-European	reh₁d-	to scrape, scratch, gnaw

Every word from Proto-Indo-European reh₁d- →Every word from Proto-Indo-European rōd- →Every word from Latin rodo →