• Webster's Revised Unabridged Dictionary
    • n Headwork hĕd"wûrk` Mental labor.
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Century Dictionary and Cyclopedia
    • n headwork Mental or intellectual labor.
    • n headwork In architecture, the heads and other ornaments on the keystone of an arch.
    • n headwork plural The group of artificial works or constructions at the head of an artificial canal or channel necessary to divert and regulate the flow of water from a river or other body of water into the canal. For an irrigating canal, the head-works would include a diversion weir, if any, with its accessories, a guard-boom to divert floating objects away from the canal-gates, head-gates or sluices to regulate the admission of water to the canal, and gaging or measuring appliances for determining the quantity of water entering the canal. For a water-power canal extending from a stream, reservoir, or millpond to a water-power station, the head-works would include a dam to divert or raise the level of the water, a guard-boom to divert large floating objects away from the entrance, a rack or screen to prevent the entrance of smaller floating material, and sluice-gates to regulate the flow of water into the canal.
    • n headwork plural A platform or raft with windlass or capstan which is attached to the front of a log-raft or boom of logs for warping, kedging. or winding it through lakes and still water, by hand or horse-power.
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In literature:

The fellow that keeps the coolest can always do the best headwork.
"Her Father's Daughter" by Gene Stratton-Porter
Trust a college boy for headwork.
"A Master's Degree" by Margaret Hill McCarter
Physical power was as yet on the side of Charity, but she hadn't a chance with him wherever headwork was wanted.
"Tom Brown's Schooldays" by Thomas Hughes
His wife was usually wrong when any headwork was required.
"The Golden Lion of Granpere" by Anthony Trollope
It wants nothing but courage; as to the headwork, I take that entirely upon myself.
"The Robbers A Tragedy" by Friedrich Schiller
My ships will be the result of the quick headwork of a peasant simpleton.
"Folk Tales from the Russian" by Various
It must be headwork this time.
"Poor Jack" by Frederick Marryat
I been doing all the headwork for you.
"Winner Take All" by Larry Evans
Crews in shifts marched tirelessly around the capstans of the headworks.
"Joan of Arc of the North Woods" by Holman Day
Headworks of Sirhind Canal are at Rupar.
"The Panjab, North-West Frontier Province, and Kashmir" by Sir James McCrone Douie

In news:

And maintaining aerobic conditions in force mains, headworks and primary clarifiers PREVENTS the formation of H2S and the associated ODORS and CORROSION.