Where does “fro” come from?

fro (Old French) comes from Latin umbrosus, from Latin umbra, from Old Latin omra, from Proto-Indo-European h₂mr-u-.

Ancestry of “fro”, step by step

fro traces back through two separate lines of ancestry.

via Latin umbrosus

StepLanguageWordMeaning
1Latinumbrosusshady, shadowy
2Latinumbraa shadow; a shade; a ghost
3Old Latinomra—
4Proto-Indo-Europeanh₂mr-u-—

via Vulgar Latin ungla

StepLanguageWordMeaning
1Vulgar Latinungla—
2Latinungulahoof, claw; a horse; an aromatic spice
3Latinunguisfingernail, toenail; claw; hoof
4Proto-Indo-Europeanh₃negʰ-nail

Words derived from “fro”

Every word from Proto-Indo-European h₂mr-u- →Every word from Old Latin omra →Every word from Latin umbra →