hammerhead shark(n = noun.animal) hammerhead - medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous;
is a kind of shark
is a member of genus sphyrna, sphyrna
has particulars: smooth hammerhead, sphyrna zygaena, smalleye hammerhead, sphyrna tudes, bonnet shark, bonnethead, shovelhead, sphyrna tiburo

angel shark, basking shark, blacktip shark, blue shark, bonito shark, bonnet shark, bull shark, card shark, carpet shark, cat shark, cow shark, cub shark, dusky shark, fox shark, great blue shark, great white shark, hammerhead, lemon shark, loan shark, mackerel shark, mako shark, man-eating shark, nurse shark, oceanic whitetip shark, reef whitetip shark, requiem shark, sand shark, sandbar shark, shark, shark oil, shark repellent, six-gilled shark, smalleye hammerhead, smooth hammerhead, smoothhound shark, soupfin shark, thresher shark, tiger shark, whale shark, white shark, white-tipped shark, whitetip shark