WordReference Random House Unabridged Dictionary of American English © 2019
head•er  (hedər),USA pronunciation n. 
  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. Hydraulicsa 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. Automotivean exhaust manifold.
  5. Building
    • a brick or stone laid in a wall or the like so that its shorter ends are exposed or parallel to the surface. Cf. stretcher (def. 5).
    • 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 Termsa plunge or dive headfirst, as into water:He stumbled and took a header into the ditch.
  7. Sport[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. Computinga line of information placed at the top of a page for purposes of identification.
  • late Middle English heder. See head, -er1 1400–50

Collins Concise English Dictionary © HarperCollins Publishers::

header /ˈhɛdə/ n
  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 brick or stone laid across a wall so that its end is flush with the outer surface
  3. the action of striking a ball with the head
  4. informal a headlong fall or dive

'header' also found in these entries:

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