spanner

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spanner

a steel hand tool with a handle carrying jaws or a hole of particular shape designed to grip a nut or bolt head

spanner

[′span·ər]
(design engineering)
A wrench with a semicircular head having a projection or hole at one end.
(engineering)
A horizontal brace.
An artificial horizon attachment for a sextant.

spanner, span piece

A horizontal cross brace or collar beam.