The story
- Proto-Indo-European*h₂erkʷ-
- Proto-Indo-European*h₂erkʷos
- Proto-Italic*arkuos
- Latinarcus
- English todayarc-
From Latin arcus (“bow, arc”), as they represent an angle or arc. Compare etymology of arch.
Words from the same roots
Latinarcus all →
arcadearcarcharcherarsonarcusarbalestarblastarchivoltarciformarcographarcosoliumarculusgonarcus
Etymology from Wiktionary, CC BY-SA 4.0.