Of a firearm or its barrel: having a spirally grooved bore.

Of a firearm or its barrel: having a spirally grooved or polygonal bore; rifled. Now historical and rare.

Firearms. Designating a firearm of relatively large calibre, esp. one larger than a weapon of.22 inch calibre or 5.6 mm bore. Also: relating to…

Of a firearm: having a bore with spiral grooves; rifled. Obsolete.

attributive. Having a smooth or unrifled bore.

(a) designating or relating to a firearm with a narrow bore (in international and Olympic shooting generally.22 inch calibre or 5.6 millimetre bore)…

Of a firearm or its barrel: not having a spirally grooved bore.

= polygroove adj. n.

= 2a.

(a) adj. (of a gun) having more than three grooves of rifling in the bore; (b) n. a polygroove rifle.

(a) n. a gun of which the bore is cylindrical or of uniform diameter; so cylinder-bored; (b) v. to make with a cylindrical bore.