/hed"euhr/ , 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.
[ 1400-50; late ME heder. See HEAD, -ER 1 ]