brass instrument,
brass a wind instrument that consists of a brass tube (usually of variable length) that is blown by means of a cup-shaped or funnel-shaped mouthpiece
bass nontechnical name for any of numerous edible marine and freshwater spiny-finned fishes
euphonium a bass horn (brass wind instrument) that is the tenor of the tuba family
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Wiktionary
Substantiv
tuba -
A large brassmusical instrument, usually in the bass range, played through a vibration of the lips upon the mouthpiece and fingering of the keys.
Wikipedia
The tuba is the largest and lowest pitched brass instrument. Sound is produced by vibrating or "buzzing" the lips into a large cupped mouthpiece. It is one of the most recent additions to the modern symphony orchestra, first appearing in the mid-19th century, when it largely replaced the ophicleide.
OmegaWiki Dictionary
Ω
tuba The largest musical instrument of the low-brass family.