1 definition by Civil Twilight 646

n. a large 3- or 4-valved brass instrument resembling a small tuba; it is similar to the baritone horn but, while the baritone has a cylindrical (straight) bore, the euphonium has a conical (grows larger as it progresses towards the bell) bore, warming up the sound
The euphonium has a dark, rich sound--except when too much garbage has been dropped down the bell.
by Civil Twilight 646 July 21, 2003

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