anglewing is a compound of angle + wing, named for the sharply angled margins of the butterfly's wings. Angle derives from Latin angulus ('corner'); wing from Old Norse vaengr. Morphologically, the word is transparent as a compound: its parts remain visible in the modern spelling, while the older history of those parts supplies the deeper ancestry. In modern use, the noun sense is "a butterfly with jagged, angular wing margins, of the genus Polygonia", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as angle, wing, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Latin angulus, Old Norse vaengr, which anchor the explanation in named linguistic material.