header

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that fits a head on an object.
• noun One that removes a head from an object, especially a machine that reaps the heads of grain and passes them into a wagon or receptacle.
• noun A pipe that serves as a central connection for two or more smaller pipes.
• noun A floor or roof beam placed between two long beams that supports the ends of the tailpieces.
• noun A brick or stone laid at a right angle to the face of a wall so that only its short end is showing.
• noun Informal A headlong dive or fall.
• noun Sports A pass or shot made in soccer by heading the ball.
• noun Textual information, such as a title, date, or page number, positioned in the top margin of a page and usually repeated throughout a document.
• noun A raised tank or hopper that maintains a constant pressure or supply to a system, especially the small tank that supplies water to a central heating system.

from The Century Dictionary.

• noun A connection at the ends of the tubes in a water-tube boiler.
• noun In a floor or roof, the timber used for framing round an opening. It is supported by two trimmers, one at either end, and, in its turn, supports the ends of the two tail-beams.
• noun A horse used in helping to haul heavily-laden vehicles up heavy grades.
• noun In cigarmaking, a workman who shapes or finishes the head or mouth-end of a cigar: also, an appliance used for the same purpose.
• noun One who or that which removes the head from something; one who beheads or decapitates: obsolete except in certain special uses.
• noun One who places a head on something, as on a nail or a pin; specifically, a cooper who puts in the heads of casks.
• noun One who or that which stands at the head of something, as one who leads a mob or party.
• noun In masonry: A heavy stone extending over the thickness of a wall.
• noun A brick laid lengthwise across the thickness of a wall and acting as a bond. See cut under inbond.
• noun A plunge or dive head foremost, as into the water, or, involuntarily, from a horse or a bicycle.
• noun One who dives head foremost.
• noun In the manufacture of needles, a person whose duty it is to turn the needles all one way, preparatory to drilling.
• noun A sod, brick, or stone placed with the end toward the interior in building revetments.
• noun A ship's mate or other officer in charge of a whale-boat; a boat-header.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who, or that which, heads nails, rivets, etc., esp. a machine for heading.
• noun rare One who heads a movement, a party, or a mob; head; chief; leader.
• noun A brick or stone laid with its shorter face or head in the surface of the wall.
• noun In framing, the piece of timber fitted between two trimmers, and supported by them, and carrying the ends of the tailpieces.
• noun A reaper for wheat, that cuts off the heads only.
• noun colloq. A fall or plunge head first, as while riding a bicycle, or a skateboard, or in bathing; -- sometimes, implying the striking of the head on the ground.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The upper portion of a page (or other) layout.
• noun Text, or other visual information, used to mark off a quantity of text, often titling or summarizing it.
• noun Text, or other visual information, that goes at the top of a column of information in a table.
• noun informal A font, text style, or typesetting used for any of the above.
• noun a brick that is laid sideways at the top of a wall or within the brickwork with the short side showing; compare stretcher
• noun a horizontal structural or finish piece over an opening
• noun a machine that cuts the heads off of grain etc
• noun soccer the act of hitting the ball with the head
• noun a headlong fall or jump
• noun computing the first part of a file or record that describes its contents
• noun networking the first part of a packet, often containing its address and descriptors
• noun A raised tank that supplies water at constant pressure, especially to a central heating and hot water system

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (soccer) the act of hitting the ball with your head
• noun brick that is laid sideways at the top of a wall
• noun horizontal beam used as a finishing piece over a door or window
• noun 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
• noun a machine that cuts the heads off grain and moves them into a wagon
• noun a headlong jump (or fall)
• noun a line of text serving to indicate what the passage below it is about