a plug or stopper placed in the muzzle of a piece of ordnance when not in use, to keep out dampness and dust.
Also, tompion.

1425–75; late Middle English tampyon, variant of tampon < Middle French, nasalized variant of Old French tapon, derivative of tape plug < Germanic. See tap2

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World English Dictionary
tampion or tompion (ˈtæmpɪən)
a plug placed in a gun's muzzle when the gun is not in use to keep out moisture and dust
[C15: from French: tampon]
tompion or tompion
[C15: from French: tampon]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1430, "plug, bung," from M.Fr. tampon, nasalized variant of O.Fr. tapon "piece of cloth to stop a hole" (1382), a suffixed form of Frank. *tappo "stopper, plug," related to O.H.G. zapfo and O.E. tæppa "stopper" (see tap (2)). Meaning "wooden plug for the muzzle of a gun"
(to keep out rain or seawater) is recorded from c.1625.
Online Etymology Dictionary, © 2010 Douglas Harper
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