tubae
tubae is a Latin form of tuba, meaning “trumpet”. It is the genitive singular feminine noun or nominative plural feminine noun.
Found 61 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 7.47.2: Ac reliquarum legionum milites non exaudito sono tubae, quod satis magna valles intercedebat, tamen ab tribunis militum legatisque, ut erat a Caesare praeceptum, retinebantur.
All forms of tuba (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.