A band, flange, ferrule, or collar, designed to grip and hold a tool or a workpiece under proper control, and usually to release it under control thereafter; such a collet usually is made of a hard, springy material, especially a metal.
The rim (of a ring) within which a jewel is set.
In an embryonic plant, the transition zone between the root and the hypocotyl (not clearly distinguishable in most plants.)
A hand tool shaped like a small crank handle, for winding the spring of a wheel lock on a musket.
One who, or that which, spans.
A problem, dilemma or obstacle; something unexpected or troublesome (in the phrase spanner in the works)
A hand tool for adjusting nuts and bolts; a wrench.
A stupid or unintelligent person; one prone to making mistakes, especially in language.
To use a spanner; to fix with a spanner