Óst-sǽ

According to the Old English Dictionary:

Óst-sǽ

the Baltic with the Cattegat, the water east of Denmark and of the Scandinavian peninsula as that on the western coast is called Westsǽ, Ors. 1, 1; Swt. 17, 3:-- Be norþan Súþdenum is ðæs gársecges earm ðe mon hǽt Ostsǽ. . . Norþdene habbaþ be norþan him ðone ilcan sǽs earm ðe mon hǽt Óstsǽ, Ors. l, 1; Swt. 16, 23-28. [Ger. Ost-see the Baltic: cf. Icel. fara á Austrveg, a phrase used of trading or piratical expeditions in the Baltic.] ost-sæ