machinis
machinis is a Latin form of machina, meaning “machine; siege engine; device, trick”. It is the ablative plural feminine noun or dative plural feminine noun.
Found 32 times in the Latin texts on Socratos.
Where it is used
Sallust, Bellum Iugurthinum 21: … er duos reges coeptum atque patratum bellum foret. Igitur Iugurtha oppidum circumsedit, vineis turribusque et machinis omnium generum expugnare aggreditur, maxime festinans tempus legatorum antecapere, quos ante proelium factum …
All forms of machina (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.