Mere-þyssa
Bosworth & Toller Anglo-Saxon Old English Dictionary - mere-þyssa
According to the Old English Dictionary:
an;
- mere-þyssa
- m. A sea-rusher, a ship :-- On mereþyssan, Andr. Kmbl. 892; An. 446. On mereþissan, 514; An. 257. [Cf. Icel. þysja to rush; þyss uproar.] mere-þyssa