any of several species of tropical marine fishes with eyes on the top of their flattened heads. They often lie just under the surface of the seabed with only the eyes visible: family Platycephalidae

(Flathead) a member of a group of indigenous peoples inhabiting the northwestern USA, formerly believed to have flattened their children's heads with weights

denoting a countersunk screw

denoting an engine in which the valves and spark plugs are in the cylinder block rather than the cylinder head