n. Barbed wire that is extended in a spiral for use as a barrier, as on a fence.
concerti′na wire`
n. wire with razor-sharp edges or projections, placed in coils as a barrier along the tops of fences or walls.
concertina wire
concertina wire
[‚kan·sər′tē·nə ‚wīr] (ordnance) A barbed wire coiled for easier handling and emplacement; when uncoiled, it forms an entanglement for the enemy infantry.