tonitru
tonitru is a Latin form of tonitrus, meaning “thunder”. It is the ablative singular masculine noun.
Found 28 times in the Latin texts on Socratos.
Where it is used
Vergil, Aeneid 4.122: desuper infundam, et tonitru caelum omne ciebo.
All forms of tonitrus (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.