Header /(hĕd"ẽr)/

Head·er

Header

n.
  1. One who, or that which, heads nails, rivets, etc., esp. a machine for heading.
  2. One who heads a movement, a party, or a mob; head; chief; leader. [R.]
  3. A brick or stone laid with its shorter face or head in the surface of the wall. (Arch.)
  4. A reaper for wheat, that cuts off the heads only.
  5. A fall or plunge head first, as while riding a bicycle, or a skateboard, or in bathing; -- sometimes, implying the striking of the head on the ground; as, to take a header. [Colloq.]