a three-valved trumpet designed especially for playing the high, florid trumpet parts in the works of J. S. Bach and other baroque composers.
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British Dictionary definitions for bach trumpet
/ (bɑːx) /
a modern small three-valved trumpet for playing clarino passages in Bach's music
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012