1. a person or thing that removes or puts a head on something.
  2. a reaping machine that cuts off and gathers only the heads of the grain.
  3. a chamber to which the ends of a number of tubes are connected so that water or steam may pass freely from one tube to the other.
  4. Automotive. an exhaust manifold.
  5. Building Trades.
    1. a brick or stone laid in a wall or the like so that its shorter ends are exposed or parallel to the surface.Compare stretcher(def 5).
    2. 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.
  6. Informal. a plunge or dive headfirst, as into water: He stumbled and took a header into the ditch.
  7. Soccer. a pass or shot made by heading the ball.
  8. a sign that is part of or attached to the top of a rack displaying merchandise.
  9. Computers. a line of information placed at the top of a page for purposes of identification.


  1. Also called: header tank a reservoir, tank, or hopper that maintains a gravity feed or a static fluid pressure in an apparatus
  2. a manifold for distributing a fluid supply amongst a number of passages
  3. a machine that trims the heads from castings, forgings, etc, or one that forms heads, as in wire, to make nails
  4. a person who operates such a machine
  5. a brick or stone laid across a wall so that its end is flush with the outer surfaceCompare stretcher (def. 5)
  6. the action of striking a ball with the head
  7. informal a headlong fall or dive
  8. computing
    1. a block of data on a tape or disk providing information about the size, location, etc, of a file
    2. (as modifier)header card; header label
  9. dialect a mentally unbalanced person

“head-first dive or plunge,” 1849, from head (n.); as a type of pass or shot with the head in soccer, by 1906.

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