1. any cylindrical piece or device on which something is wound.
  2. a small cylindrical piece of wood or other material on which yarn is wound in spinning, for use in weaving; a bobbin.
  3. a small cylinder of wood or other material on which thread, wire, or tape is wound, typically expanded or with a rim at each end and having a hole lengthwise through the center.
  4. the material or quantity of material wound on such a device.
  5. Angling. the cylindrical drum in a reel that bears the line.

verb (used with object)

  1. to wind on a spool.
  2. to unwind from a spool (usually followed by off or out).
  3. Computers. to operate (an input/output device) by using buffers in main and secondary storage.

verb (used without object)

  1. to wind.
  2. to unwind.


  1. 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
  2. anything round which other materials, esp thread, are wound


  1. (sometimes foll by up) to wind or be wound onto a spool or reel

n.early 14c., from Old North French spole, espole “a spool” (13c.), from Middle Dutch spoele “a spool,” from Proto-Germanic *spolon (cf. Norwegian and Swedish spole, Old High German spuola, German Spule), from PIE root *spel- “to cleave, split” (see spoil). v.c.1600, from spool (n.). Related: Spooled; spooling.

  1. To store data that is sent to a device, such as a printer, in a buffer that the device reads. This procedure allows the program that sent the data to the device to resume its normal operation without waiting for the device to process the data.

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