From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. The long, round, slender rod or pin in spinning wheels by which the thread is twisted, and on which, when twisted, it is wound; also, the pin on which the bobbin is held in a spinning machine, or in the shuttle of a loom.
2. A slender rod or pin on which anything turns; an axis; as, the spindle of a vane. Specifically: (a) (Mach.) The shaft, mandrel, or arbor, in a machine tool, as a lathe or drilling machine, etc., which causes the work to revolve, or carries a tool or center, etc. (b) (Mach.) The vertical rod on which the runner of a grinding mill turns. (c) (Founding) A shaft or pipe on which a core of sand is formed.
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