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transposing instrument

noun

a musical instrument played at a pitch different from that indicated in the score.

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Origin of transposing instrument

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for transposing instrument

transposing instrument

noun

a musical instrument, esp a horn or clarinet, pitched in a key other than C major, but whose music is written down as if its basic scale were C major. A piece of music in the key of F intended to be played on a horn pitched in F is therefore written down a fourth lower than an ordinary part in that key and has the same key signature as a part written in C
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