TOMPION

tompion. Tompion, n. the stopper of a cannon

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Tom″pi‐on (?), n. [[See Tampios]] 1. 1. A stopper of a cannon or a musket. See Tampion.
2. 2. (Mus.) A plug in a flute or an organ pipe, to modulate the tone. Knight.
3. 3. The iron bottom to which grapeshot are fixed.