kraken

n. [ Prob. from OSw. krake, or ODan. krage the trunk of a tree, the branches of which are not entirely cut off, to which it was likened by the Norwegian mariners. ] A fabulous Scandinavian sea monster, often represented as resembling an island, but sometimes as resembling an immense octopus. [ 1913 Webster ]

To believe all that has been said of the sea serpent or kraken, would be credulity; to reject the possibility of their existence, would be presumption. Goldsmith. [ 1913 Webster ]

Like a kraken huge and black. Longfellow. [ 1913 Webster ]