From Old English 'earh,' PIE *h₂érkʷo- (bow) — the projectile named for its weapon, making 'arrow,' 'arc,' 'arch,' and 'archery' all kin.
A shaft with a pointed head, designed to be shot from a bow.
From Old English 'earh' (arrow), from Proto-Germanic *arhwō (arrow, something belonging to the bow), from PIE *h₂érkʷo- (bow, arrow). The PIE root *h₂érkʷo- also produced Latin 'arcus' (bow, arch, arc) and possibly Gothic 'arhwazna' (arrow). The connection between the projectile and the weapon that fires it is embedded in the root itself — the arrow