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From Middle English spole (possibly via Old Northern French spole, espole), from Middle Dutch spoele, from Old Dutch *spōla, *spuola, from Proto-Germanic *spōlǭ (“spool”), from Proto-Indo-European *spel- (“to cleave, split”). Cognate with Saterland Frisian Spoule (“spool”), Dutch spoel (“spool”), German Spule (“spool”), Swedish spole (“spool”), Icelandic spóla (“spool; reel”). The aviation usage is based on the visual similarity of one of the spools of a turbine engine to a spool used for thread (especially in cross-section).
spool (plural spools)
- A reel; a device around which thread, wire or cable is wound, especially a cylinder or spindle.
- 2011, Rebekah Modrak; Bill Anthes, Reframing Photography: Theory and Practice:
- If you need to reload film, the cassette can be rewound slightly by turning the hub located on one end of its spool.
- (aviation) One of the rotating assemblies of a gas turbine engine, composed of one or more turbine stages, a shaft, and one or more compressor or fan stages.
- The high-pressure spool rotates faster than the intermediate- and low-pressure spools, as the high-pressure turbine is driven by superheated combustion gases straight out of the burners, while the high-pressure compressor has to spin very fast to compress air that has already been compressed and heated by the low- and intermediate-pressure compressors.
- (computing) A temporary storage area for electronic mail, etc.
(rotating assembly of a turbine engine):
spool (third-person singular simple present spools, present participle spooling, simple past and past participle spooled)
- To wind on a spool or spools.
- (computing) To send files to a device or a program (a spooler or a daemon that puts them in a queue for processing at a later time).
to send files to some device or program that puts them in a queue for later processing of some kind
spool (plural spools)
- A small swimming pool that can be used also as a spa.
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