The lowest brass wind instrument WordNet 3.0 & Open English WordNet

The tuba is the largest and lowest-pitched musical instrument in the brass family. Wikipedia

The sousaphone is a brass instrument in the tuba family. Wikipedia

Musical instrument that plays notes in the bass clef. Wikipedia Disambiguation

Marching-band-suitable tuba associated with John Philip Sousa Wikipedia Disambiguation

Type of musical instrument of the brass family Wikidata

Brass musical instrument Wikidata

The largest musical instrument of the low-brass family. OmegaWiki

A large brass instrument in the bass range, usually referring to the modern tuba or the archaic serpent. Wiktionary

An obsolete wind instrument in the brass family, whose shape is suggestive of a snake (Wikipedia article). Wiktionary

A valved brass instrument with the same length as a tuba, but shaped differently so that the bell is above the head, that the valves are situated directly in front of the musical instruments and a few inches above the waist, and that most of the weight rests on one shoulder. Wiktionary

Brass instrument. Wiktionary (translation)

A large brass musical instrument, usually in the bass range, played through a vibration of the lips upon the mouthpiece and fingering of the keys. Wiktionary

A large brass musical instrument. Wiktionary (translation)