noun A reel; a device around which thread, wire or cable is wound, especially a cylinder or spindle.
noun 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.
noun A temporary storage area for electronic mail, etc.
noun A splinter caught in the skin.
verb To wind on a spool or spools.
verb 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).
noun A small swimming pool that can be used also as a spa.