hook


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Related to hook: hook up

hook

1. a piece of material, usually metal, curved or bent and used to suspend, catch, hold, or pull something
2. short for fish-hook
3. 
a. a sharp bend or angle in a geological formation, esp a river
b. a sharply curved spit of land
4. Boxing a short swinging blow delivered from the side with the elbow bent
5. Cricket a shot in which the ball is hit square on the leg side with the bat held horizontally
6. Golf a shot that causes the ball to swerve sharply from right to left
7. Surfing the top of a breaking wave
8. Ice hockey the act of hooking an opposing player
9. Music a stroke added to the stem of a written or printed note to indicate time values shorter than a crotchet
10. another name for a sickle
11. a nautical word for anchor

Hook

 

in machine building, a part of load-lifting machines that suspends loads or lifting attachments on the cables or chains of hoisting mechanisms (load hook); a part of transport machines that transmits tractive forces (coupling hook, draw hook), as between a tractor and trailer. Hooks are made as single hooks or double (sister) hooks. Load hooks made of cast or unit-forged steel have load-lifting capacities of up to 75 tons; laminated load hooks made of drop-forged steel plates have load-lifting capaci-ties of more than 75 tons. Coupling hooks are usually forged or cast single hooks. The main characteristics of hooks are standardized.

hook

[hu̇k]
(computer science)
A modification of a computer program to add instructions to an existing part of the program.
(design engineering)
A piece of hard material, especially metal, formed into a curve for catching, holding, or pulling something.
(electronics)
A circuit phenomenon occurring in four-zone transistors, wherein hole or electron conduction can occur in opposite directions to produce voltage drops that encourage other types of conduction.
(geography)
The end of a spit of land that is turned toward shore. Also known as hooked spit; recurved spit.

hook

hood, 1
1. A curved or bent metal device used for attachment.
2. A bend in the end of a reinforcing bar; also see hooked bar.

HOOK

(1)
? Object Oriented Kernel. Delphia. An object-oriented extension of Delphia Prolog.

hook

(programming)
A software or hardware feature included in order to simplify later additions or changes by a user.

For example, a simple program that prints numbers might always print them in base 10, but a more flexible version would let a variable determine what base to use; setting the variable to 5 would make the program print numbers in base 5. The variable is a simple hook. An even more flexible program might examine the variable and treat a value of 16 or less as the base to use, but treat any other number as the address of a user-supplied routine for printing a number. This is a hairy but powerful hook; one can then write a routine to print numbers as Roman numerals, say, or as Hebrew characters, and plug it into the program through the hook.

Often the difference between a good program and a superb one is that the latter has useful hooks in judiciously chosen places. Both may do the original job about equally well, but the one with the hooks is much more flexible for future expansion of capabilities.

Emacs, for example, is *all* hooks.

The term "user exit" is synonymous but much more formal and less hackish.

hook

In programming, instructions that provide breakpoints for future expansion. Hooks may be changed to call some outside routine or function or may be places where additional processing is added. See also switch hook.
References in classic literature ?
But naturally being a thin-legged person (though vindictive and sandy whiskered)--he was quite unable to lift the heavy weight to the level of the hook and rope.
Once or twice Manuel found time to help him without breaking the chain of supplies, and once Manuel howled because he had caught his finger in a Frenchman's hook.
Not the sort of line I use," answered Hook, with satisfaction.
Expecting momentarily to be dashed to destruction he presently found himself deposited gently upon the soft, ochre moss of a dead sea-bottom, bodily no worse off for his harrowing adventure than in the possession of a slight swelling upon his forehead where the metal hook had struck him.
Each of the men driving the harnessed spans lifted up the double- trees so that the girl could grasp the hooks.
Then small fish-sharks began to bite, and after losing a hook apiece, we hauled in and waited for the sharks to go their way.
Pricked by the first hook it touches, the sturgeon gives a startled leap and comes into contact with half a dozen more hooks.
Did I never tell you the yarn about Henry getting the fish hook in his nose, Mistress Blythe?
Maston, scratching with his steel hook his gutta-percha cranium.
He had no net, hook, or line, and he could not be a fisherman; his boat had no cushion for a sitter, no paint, no inscription, no appliance beyond a rusty boathook and a coil of rope, and he could not be a waterman; his boat was too crazy and too small to take in cargo for delivery, and he could not be a lighterman or river-carrier; there was no clue to what he looked for, but he looked for something, with a most intent and searching gaze.
She had told Tom, however, that she should like him to put the worms on the hook for her, although she accepted his word when he assured her that worms couldn't feel (it was Tom's private opinion that it didn't much matter if they did).
Then he took the hook and softly, noiselessly, fixed it in the catch.