Pronunciation: (hed'ur),[key] —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. 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. Auto.an exhaust manifold.
5. Building Trades. a. 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).
b. 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.