The story
- Late Latin · derived fromsanguinōsus
- Middle French · derived fromsanguineux
- Middle English · inherited fromsanguinous, sangwynouse“sanguine; of eyes: bloodshot”
- English todaysanguinous
From Middle English sanguinous, sangwynouse (“sanguine; of eyes: bloodshot”), from Middle French sanguineux and its etymon Late Latin sanguinōsus.
Etymology from Wiktionary, CC BY-SA 4.0.