Occurring in a 1086 Medieval Latin translation of the Domesday Book, from Old English mereswīn (“porpoise”), but probably reborrowed from another Germanic source cognate to the Old English word, from Old Frankish *mariswīn, Middle Dutch meerswijn, or Old Norse marsvín (“dolphin”), all ultimately from Proto-Germanic *mariswīną (“dolphin, porpoise”). More at English mereswine. Cf. also the Old French porpeis.
marsouin m (plural marsouins)
- “marsouin” in le Trésor de la langue française informatisé (The Digitized Treasury of the French Language).