Definition of "hammerhead" []

• The head of a hammer. (noun)
• Any of several predatory sharks of the genus Sphyrna, having the sides of the head elongated into fleshy extensions with the eyes at the ends. (noun)
• A wading bird (Scopus umbretta) of Africa and southwest Asia, having brown plumage, a large bladelike bill, and a long backward-pointing crest. Also called hammerkop, umbrette. (noun)
• An African fruit bat (Hypsignathus monstrosus), the male of which has a distinctive enlarged head. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Aquaman comes across more thugs, but this time, when he calls a hammerhead shark to help, it he who is the on the receiving end of its wrath: ..."
• "By designing special enzymes called hammerhead ribozymes, the researchers were able to target a so-called"
• "The viroids that Sanjuán and his colleagues studied contain a stretch of RNA called a hammerhead enzyme that speeds up the viroid's duplication in an enzymelike way."