Ýþ-mearh

According to the Old English Dictionary:

ýþ-mearh

gen. -meares; m. A wave-steed, a ship :-- Sundhengestas, ealde ýðmearas, Exon. Th. 54, 5; Cri. 864. Se micla hwæl bisenceþ sǽlíþende, eorlas and ýðmearas, 363, 5; Wal. 49. yþ-mearh