Barrelled : of Barrel

Barrelled a. : Having a barrel; -- used in composition; as, a double-barreled gun.

Example:
What are the implications of double-Barrelled surnames?

Taxonomy
spaces, Barrelled space, free encyclopedia, Topological vector spaces, barrelled set, barrel, History, J. Robertson, areas of mathematics, search, Hausdorff, Fourier, 5-16, continuous dual, carries, Banach spaces, Cambridge Tracts, Schaefer.

Defination from the web:
barrelled set or a barrel in a topological vector space is a set which is convex, balanced, absorbing and closed. ... In a semi normed vector space the unit ball is a barrel. Every locally convex topological vector space has a neighbourhood basis consisting of barrelled sets. ...