Hām'mer-hēad, n.
(Ichth.) A shark of the genus Zygæna, having the eyes set on projections from the sides of the head, which gives it a hammer shape; balance-fish. The Zygæna malleus is found in the North Atlantic.
(Ichth.) A shark of the genus Zygæna, having the eyes set on projections from the sides of the head, which gives it a hammer shape; balance-fish. The Zygæna malleus is found in the North Atlantic.