tampion(n = noun.artifact) tompion - plug for the muzzle of a gun to keep out dust and moisture;
is a kind of plug, stopper, stopple
1. A wooden stopper, or plug, as for a cannon or other piece of ordnance, when not in use. [1913 Webster]
2. A plug for upper end of an organ pipe. [1913 Webster]
tampion, n. (also tompion)
1 a wooden stopper for the muzzle of a gun.
2 a plug e.g. for the top of an organ-pipe.
Etymology:
ME f. F tampon, nasalized var. of tapon, rel. to TAP(1)