header

Short definition from Wiktionary

Noun

1. 1
   The upper portion of a page (or other) layout.
2. 2
   Text, or other visual information, used to mark off a quantity of text, often titling or summarizing it.
3. 3
   Text, or other visual information, that goes at the top of a column of information in a table.
4. 4
   A font, text style, or typesetting used for any of the above.
5. 5
   The first part of a file or record that describes its contents.
6. 6
   Clipping of header file.
7. 7
   the first part of a packet or stream, often containing its address and descriptors.
8. 8
   A brick that is laid sideways (on its largest face), for example at the top of a wall or within the brickwork, with its smallest side showing (oriented so that that side is wider than it is tall).
9. 9
   A horizontal structural or finish piece over an opening.
10. 10
    A machine that separates and gathers the heads of grain etc.
11. 11
    The act of hitting the ball with the head.
12. 12
    Someone who heads the ball.
13. 13
    A headlong fall, jump or dive.
14. 14
    A raised tank that supplies water at constant pressure, especially to a central heating and hot water system.
15. 15
    A pipe which connects several smaller pipes.
16. 16
    The rodeo performer who drives the steer toward the heeler to be tied.
17. 17
    One who puts a head on something.
18. 18
    A headcase; a nutjob (mentally unbalanced, unpredictable person).

Verb

1. 1
   To strike (a ball) with one's head.