header

n. 1. One who, or that which, heads nails, rivets, etc., esp. a machine for heading. [ 1913 Webster ]

2. One who heads a movement, a party, or a mob; head; chief; leader. [ R. ] [ 1913 Webster ]

3. (Arch.) (a) A brick or stone laid with its shorter face or head in the surface of the wall. (b) In framing, the piece of timber fitted between two trimmers, and supported by them, and carrying the ends of the tailpieces. [ 1913 Webster ]

4. A reaper for wheat, that cuts off the heads only. [ 1913 Webster ]

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. ] [ PJC ]