regulam
regulam is a Latin form of regula, meaning “ruler; rule, pattern”. It is the accusative singular feminine noun.
Found 31 times in the Latin texts on Socratos.
Where it is used
Pliny the Younger, Epistulae 3.1.3: Hanc regulam Spurinna constantissime servat; quin etiam parva haec - parva si non cotidie fiant - ordine quodam et velut orbe circumagit.
All forms of regula (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.