Webster's Revised Unabridged Dictionary · 1913

Tampion

Tampion , noun

[French tampon, tapon, tape, of Dutch or German origin. See Tap a pipe or plug, and compare Tamp, Tampop, Tompion.]

1.
A wooden stopper, or plug, as for a cannon or other piece of ordnance, when not in use.
2.
(Music) A plug for upper end of an organ pipe.