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1. 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. the action of striking a ball with the head
6. Computing a block of data on a tape or disk providing information about the size, location, etc., of a file
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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A masonry unit laid so that its short end is parallel to the face, overlapping two adjacent widths of masonry; a framing member supporting the ends of joists, transferring the weight of the latter to parallel joists and rafters.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
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[′hed·ər] (building construction)
A framing beam positioned between trimmers and supported at each end by a tail beam.
(civil engineering)
Brick or stone laid in a wall with its narrow end facing the wall.
(communications)
The first section of a message, which contains information such as the addressee, routing, data, and origination time.
(computer science)
(electricity)
A mounting plate through which the insulated terminals or leads are brought out from a hermetically sealed relay, transformer, transistor, tube, or other device.
(engineering)
A pipe, conduit, or chamber which distributes fluid from a series of smaller pipes or conduits; an example is a manifold.
(graphic arts)
Text that is printed at the top of every page of a document or report; may contain the page number.
(mechanical engineering)
A machine used for gathering or upsetting materials; used for screw, rivet, and bolt heads.
(mining engineering)
An entry-boring machine that bores the entire section of the entry in one operation.
A rock that heads off or delays progress.
A blasthole at or above the head.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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1. A masonry unit, laid so that its ends are exposed, overlapping two or more adjacent withes of masonry and tying them together; a bondstone; a bonder.
2. A header joist.
3. A framing member which crosses and supports the ends of joists, rafters, etc., transferring the weight of the latter to parallel joists, rafters, etc.
4. In plumbing, a pipe having many outlets which are parallel and frequently at 90° to the center line of the pipe.
5. A chamber into which a number of pipes open.
6. A platform header.
7. A transverse raceway for electrical conductors which provides access to a cellular floor, thereby permitting the convenient installation of electrical conductors.
8. The structural member immediately over a door opening.
header joist, header, lintel, trimmer joist
header joist
header, 3
header, 1
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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(1)The portion of a packet, preceding the actual data,
containing source and destination addresses, error checking
and other fields.
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(2)The part of an electronic mail message or news article
that precedes the body of a message and contains, among other
things, the sender's name and e-mail address and the date and
time the message was sent.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
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the cutting unit of a grain-harvesting combine. It cuts the stalks and feeds them on a conveyor to the thresher.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.