flathead

/F L AE1 T HH EH0 D/
noun
  1. 1

    Any fish in the Platycephalidae family.

  2. 2

    (plural only "flatheads") A type of screw or bolt designed to fit in a countersink so that it sits flush with a surface.

  3. 3

    (plural only "flatheads") 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
  1. 1

    A large freshwater catfish native to North America, Pylodictis olivaris.

Source: https://en.wiktionary.org/wiki/flathead, https://en.wiktionary.org/wiki/flathead%20catfish