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The best instrument in the band, played by the select few. It is in the shape of a small tuba, and makes the sound of a trombone, but with a more mellow tone. It has four valves. While tromboners believe that they are the best and most important players of the band or orchestra, this is wrong, as the euphoniums can make the sound of a trombone, play in the style of a trombone, but better. The euphonium can play faster than a trombone, play more lyrical than a trombone, and is the better than the trombone in many ways. A euphonium player, in person, is more humble and is not egotistical, but on the internet, they can be as big a braggart as any other instrument's player. However, they aren't as egotistic as the trumpets. Euphonium players constantly hate being asked what their instrument is. If you mess with a euphonium player, you will get hurt.
Guy 1: What is that?

Guy 2: Looks like a tuba...

Euphonium player: This is a euphonium, fucktard.

Guy 2: A what?

Guy 1: A euphonit?

Euphonium player: EUPHONIUM.

*Euphonium player walks off and a trumpet player walks in*

Trumpet player: Euphonium players are so egotistical...

*Euphonium player runs up and beats the shit out of the trumpet player, then walks off*

Euphonium: Egotistical bastard...
by The Euphonium King November 29, 2011
36 11
A low brass instrument also referred to as a baritone. Comes from the word euphonic, meaning good sound. The single most awesome instrument in the world, if not simply for the name. Most people don't know what it is and ask in their peasantish ignorance. These people should be smacked.
What the hell is that man?
It's a Euphonium biatch! SMACK
by chez man October 13, 2005
407 115
The single most important instrument in the low brass section of a band. The players are often anal about the performance of other band members epically trumpets, and they are often the best players in the band.
Band Director: Thank you Euphonium's for an exceptional performance.
Euphonium player: It would have been better but the trumpets egos got in the way!
by euphsrock October 10, 2007
246 64
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
196 22
Mosty definitely the most admired instrument in the band. The euphonium is a precious part of the symphonic band, as is the baritone to the marching band, because it provides a rich, dark sound to sustain the bottom of the band. This is the sounds that all other band members envy. These instruments, with the assistance of the rest of the low brass, give the band the edge needed to win superiors. Plain and simple, euphoniums rule!
"Wow! Did you hear that Euphonium solo? It was spectacular!"
by JewC June 02, 2008
165 46
what sex would be if it was an instrument. in a high school band the

Euphonium players are to cool to practice, but cause they play the Euphonium it sounds like sex.

person #1 "wow that song they just played sounds like sex"

person #2 "yea cause the Euphonium section is playing every part"
by divine maddog January 24, 2009
148 43
a low brass instrument with 3 or 4 valves that can be played in treble or bass clef. hardly anybody knows what it is so euphonium players often get tired of explaining it. they are usually the least ignorant section in low brass and the smallest and most talented section in the band.
band director: can someone please explain the coda to the trombones!?
euphonium section: we can! we can!
by honorband71 July 02, 2010
87 7
A mysterious instruments played by the select few. It is the most important instrument of the low brass. The players get sick and tired of people asking what a Euphonium is, and most likely didn't tell you. That is why you are on Urban Dictionary.
Guy 1: What's a Euphonium?
Euphonium Player: *face palm*
by A Euph Player February 23, 2011
55 5