Hammerhead/ˈhæmərhed/ Definition 1 of 3Pro Tip 1/3Unique Head The term emphasizes the shark’s distinct head shape, resembling a hammer. The hammerhead looks unlike any other species in the ocean. Pro Tip 2/3Shark Species Used when talking about the wider species or studying ocean life. Divers explored the reef to observe hammerhead behavior. Pro Tip 3/3Underwater Context Appropriate in contexts related to the marine environment and wildlife. She wrote a thesis on hammerhead habitats.