Etymology
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tuba (n.)

1852 in reference to a modern, large, low-pitched brass musical instrument, from French tuba, from Latin tuba (plural tubae) "straight bronze war trumpet" (as opposed to the crooked bucina), related to tubus (see tube (n.)).

updated on February 20, 2014

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Definitions of tuba from WordNet

tuba (n.)
the lowest brass wind instrument;
Synonyms: bass horn / sousaphone
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.