flathead

Etymology

flat + head

noun

  1. Any fish in the family Platycephalidae.
  2. (US, informal) Alternative form of flathead catfish
  3. (plural only "flatheads") A type of screw or bolt designed to fit in a countersink so that it sits flush with a surface.
  4. (plural only "flatheads", automotive) 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.

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