noun
tuba
TOO-buh/ˈtuːbə/
A large brass musical instrument that produces low notes.
The tuba provides deep, steady notes beneath the band's melody.

Etymology
Latin tuba named a straight bronze war trumpet. That ancient instrument name was later applied to the modern, very large, low-pitched member of the trumpet family.
In context
the tuba and contrabassoon which are doubling each other right got that really really low G natural
More examples
- She plays the tuba in her school band.
- Two tubas add a rich bass sound to the orchestra.
- He carries his tuba in a large padded case.
Forms
tuba · tubas
tubist noun — A musician who plays the tuba.
Similar words
- sousaphone
- A type of tuba that wraps around a marching player.