a cylindrical device on which film, magnetic tape, thread, or other flexible materials can be wound; a reel

spools of electrical cable

wind (magnetic tape, thread, etc.) on to a spool

he was trying to spool his tapes back into the cassettes with a pencil eraser

send (data that is intended for printing or processing on a peripheral device) to an intermediate store

users can set which folder they wish to spool files to

(of an engine) increase its speed of rotation, typically to that required for operation

a jet engine can take up to six seconds to spool up