Tuba definition

to͝obə, tyo͝o-

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A large, valved, brass instrument with a bass pitch.

noun

A reed stop in an organ, having eight-foot pitch.

noun

In ancient Rome, a straight war trumpet.

noun

Any of a group of brass instruments with a conical bore and three to five valves, esp. the large contrabass member.

noun

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.

noun

Other Word Forms

Singular:

tuba

Plural:

tubas

Italian from Latin trumpet tubus tube

From American Heritage Dictionary of the English Language, 5th Edition
From Latin tuba (“tube, trumpet").

From Wiktionary