A cylindrical device on which film, magnetic tape, thread, or other flexible materials can be wound; it typically has a hole in the center for mounting.
She carefully wound the thread around the spool to prevent it from tangling.
A cylindrical rod or plug with enlarged ends that slides inside a valve body to control the flow of fluid.
The hydraulic system failed because the spool inside the control valve had worn down.
Computing: a buffer or queue that holds data waiting to be transferred to a peripheral device.
The print job stalled when the spool on the server became full.
A quantity or length of thread, wire, film, or similar material wound on a spool and treated as a single unit for sale or use.
He bought a spool of copper wire to complete the wiring job.
A quantity or length of thread, wire, film, etc., wound around a spool.