Euphranium 

Noun: The "uncommon" language. It is usually used to "dumb down" a phrase for a person of importance. This word was coined in the 1976 movie "The Slipper and the Rose."

Please use the king's euphranium whilst you speak to him.

Euphranium by Guapodelguapos December 29, 2009

Euphonium

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*

Euphonium by A Euph Player March 11, 2011

euphonium player 

A very talented sexy musican who is a natural born kisser

That euphonium player is a sexy beast

euphonium player by talented man September 12, 2015

euphonium

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!

euphonium by honorband71 July 7, 2010

euphonium

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.

euphonium by Civil Twilight 646 July 21, 2003

Euphonium

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!

Euphonium by euphsrock October 25, 2007

Euphonium

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
OW!

Euphonium by chez man October 16, 2005