A pond-head made of a great height to keep in water for the supply of a mill, etc., so that the wheel of the mill may be turned by the water rushing thence, through a passage or flood-gate. St. 27 Eliz. c. 19. Also an arm of the sea surrounded by land except at the entrance. In admiralty law and marine insurance. A bending or curving of the shore of the sea or of a lake, State v. Gilmanton, 14 N. H. 477. An opening into the land, where the water is shut in on all sides except at the entrance. U. S. v. Morel, 13 Amer. Jur. 2S0, Fed. Cas. No. 15,807.