span"ner(spn"nr), n. 1. One who, or that which, spans.
2. The lock of a fusee or carbine; also, the fusee or carbine itself.
3. An iron instrument having a jaw to fit a nut or the head of a bolt, and used as a lever to turn it with; a wrench; specifically, a wrench for unscrewing or tightening the couplings of hose.
[Chiefly British usage]
4. pl. A contrivance in some of the earlier steam engines for moving the valves for the alternate admission and shutting off of the steam.
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