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a device around which magnetic tape, film, cotton, etc., can be automatically wound, with plates at top and bottom to prevent it from slipping off


(graphic arts)
A flanged cylinder in a camera on which unprocessed roll film is wound.
(mechanical engineering)
The drum of a hoist.
The movable part of a slide-type hydraulic valve.
A cylinder made of wood or other material on which yarn is held during spinning or weaving.


(operating system)


An object-oriented logic programming language.

["An Experience with a Prolog Based Language", K. Fukunaga et al, SIGPLAN Notices 21(11):224-231 (Nov 1986) (OOPSLA '86)].


(operating system)
To send files to some device or program (a "spooler" or demon) that puts them in a queue for later processing of some kind. Without qualification, the spooler is the "print spooler" controlling output of jobs to a printer; but the term has been used in connection with other peripherals (especially plotters and graphics devices) and occasionally even for input devices.

The term "SPOOL" has been attributed to IBM as an acronym for Simultaneous Peripheral Operation On-Line but it's widely thought to have been contrived for effect.

References in periodicals archive ?
Penny machine quilted swirls in the spools and a feathered arc in each white patch.
HELP your child recycle empty ribbon spools into colourful noisemakers for New Year''''s Eve.
Carefully arrange the two ends of the shoelaces coming out of one side of the threaded spool to the left side of the spool and the other ends to the right side of the spool.
We also extrude film cores, another complement to parts of our reel and spool business.
Spool flange diameter may be up to 220 mm (8-43/64 in.
Note: If you get the cast control cap too loose you will have to use your thumb to stop the spool from turning (thumbing or feathering the spool), to prevent a bird's nest developing.
The Polar Therm has a spool mechanism identical to the Polar, but is built into a round plastic frame that covers an 8- or 10-inch hole.
Such ornaments were a fundamental part of Maya dress for both men and women; replacing a captured enemy's ear spools with strips of paper was a symbol of humiliation and defeat.
Combine that spool and a pencil and a rubber band, and you had a tractor.
Its Enhanced Body Technology yields a rounder, more compact physical stature that resists burying in the spool.
The choice is either a traditional fixed spool reel or a multiplier.
A MACH 3 frontdrag fixed-spool reel with spare spools is in this pounds 120 prize package for the top January boat catch.