From WordNet (r) 3.0 (2006):
header
n 1: a line of text serving to indicate what the passage below
it is about; "the heading seemed to have little to do with
the text" [syn: heading, header, head]
2: horizontal beam used as a finishing piece over a door or
window [syn: header, lintel]
3: brick that is laid sideways at the top of a wall [syn:
header, coping, cope]
4: a framing member crossing and supporting the ends of joists,
studs, or rafters so as to transfer their weight to parallel
joists, studs, or rafters
5: a machine that cuts the heads off grain and moves them into a
wagon
6: (soccer) the act of hitting the ball with your head
7: a headlong jump (or fall); "he took a header into the
shrubbery"