a person or thing that removes or puts a head on something.
a reaping machine that cuts off and gathers only the heads of the grain.
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.
Automotive. an exhaust manifold.
Building Trades.
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 ).
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.
Informal. a plunge or dive headfirst, as into water: He stumbled and took a header into the ditch.
Soccer. a pass or shot made by heading the ball.
a sign that is part of or attached to the top of a rack displaying merchandise.
Computers. a line of information placed at the top of a page for purposes of identification.

1400–50; late Middle English heder. See head, -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
header (ˈhɛdə)
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.  Compare stretcher a brick or stone laid across a wall so that its end is flush with the outer surface
6.  the action of striking a ball with the head
7.  informal a headlong fall or dive
8.  computing
 a.  a block of data on a tape or disk providing information about the size, location, etc, of a file
 b.  (as modifier): header card; header label
9.  dialect a mentally unbalanced person

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. heafod "top of the body," also "upper end of a slope," also "chief person, leader, ruler," from P.Gmc. *khaubuthan (cf. O.S. hobid, O.N. hofuð, O.Fris. haved, Ger. Haupt, Goth. haubiþ "head"), from PIE *kauput- "head" (cf. Skt. kaput-, L. caput "head"), also "bowl" (as in skull). Modern
spelling is c.1420, representing what was then a long vowel (as in heat). Meaning "obverse of a coin" is from 1684; meaning "foam on a mug of beer" is first attested 1545; meaning "toilet" is from 1748, based on location of crew toilet in the bow (or head) of a ship. Synechdochic use for "person" (as in head count) is first attested 1535; of cattle, etc., in this sense from 1513. To give head "perform fellatio" is from 1950s. Meaning "drug addict" (usually in a compound with the preferred drug as the first element) is from 1911. The verb head "to shape one's course toward" (1835) was originally nautical. Header "head-first dive or plunge" first attested 1849. Headlight is from 1861, originally of ships and locomotives. Headquarters is from 1647. Headstrong "determined to have one's way" is from 1398. Headroom "space above the head" first recorded 1851. Headphone is 1914, with second element extracted from telephone. Phrase head over heels is "a curious perversion" [Weekley] of M.E. heels over head. Phrase heads will roll "people will be punished" (1930) translates Adolf Hitler.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

head (hěd)

  1. The uppermost or forwardmost part of the human body, containing the brain and the eyes, ears, nose, mouth, and jaws.

  2. The analogous part of various vertebrate and invertebrate animals.

  3. The pus-containing tip of an abscess, a boil, or a pimple.

  4. The rounded proximal end of a long bone.

  5. The end of a muscle that is attached to the less movable part of the skeleton.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for headers
Wheat headers are similar except that the reel is not equipped with teeth.
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