Where does “re-” come from?

re- (Old Portuguese) comes from Latin re-, from Proto-Indo-European wret-, from Proto-Indo-European wert-, from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

Ancestry of “re-”, step by step

Step	Language	Word	Meaning
1	Latin	re-	back, backwards; again; prefix added to various...
2	Proto-Indo-European	wret-	—
3	Proto-Indo-European	wert-	to turn, to rotate
4	Proto-Indo-European	wer-	to burn; to cover, heed, notice; squirrel

Words derived from “re-”

re-
re-
Re-

Every word from Proto-Indo-European wer- →Every word from Proto-Indo-European wert- →Every word from Latin re- →