1) Stopper 
A block of wood inserted into the barrel of a gun on a 19th century warship to keep out the sea spray.
A block of wood inserted into the barrel of a gun on a 19th century warship to keep out the sea spray.
Tompion (1957-?) was an American Thoroughbred race horse owned by Cornelius Vanderbilt Whitney. Immaculately bred, Tompion was the son of the Hall of Fame horse Tom Fool. His damsire was Count Fleet, the 1943 U.S. Triple Crown champion. Trained by Robert L. Wheeler, as a two-year-old, Tompion won the Hopeful Stakes, and placed in the Champagne Sta...
• (n.) A plug in a flute or an organ pipe, to modulate the tone. • (n.) A stopper of a cannon or a musket. See Tampion. • (n.) The iron bottom to which grapeshot are fixed.
Thomas Tompion (1639-1713) was an English master clockmaker and watchmaker. He is known today as the father of English watchmaking.
Tom'pi·on noun [ See Tampios ] 1. A stopper of a cannon or a musket. See Tampion . 2. (Mus.) A plug in a flute or an organ pipe, to modulate the tone. Knight. 3. The iron bottom to which grapeshot are fixed. 
A tompion is a plug in a flute or an organ pipe, used to modulate the tone.