Definition of "flathead" [flathead]

• Any fish in the Platycephalidae family (noun)
• A type of screw designed to fit in a countersink so that it sits flush with a surface (noun)
• A type of engine that has the valves placed in the engine block beside the piston, instead of in the cylinder head, as in an Overhead Valve engine (noun)

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• "In fact, around here, flathead catfish are introduced, and causing some problems with the native fish, so any removal of flathead is good news in my book."
• "Of course, the flathead is far from being the Upper Mississippi's glamour species."
• "Most fish shops will remove the bones and sell you what is called a flathead tail, but a lot of meat is lost in the process and accordingly one pays quite a lot for them."