doctrinis
doctrinis is a Latin form of doctrina, meaning “teaching, instruction; learning”. It is the ablative plural feminine noun or dative plural feminine noun.
Found 26 times in the Latin texts on Socratos.
Where it is used
Cicero, De Republica 2.18: … ile ad credendum inpellerentur, Romuli autem aetatem minus his sescentis annis iam inveteratis litteris atque doctrinis omnique illo antiquo ex inculta hominum vita errore sublato fuisse cernimus. Nam si, id quod Graecorum invest …
All forms of doctrina (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.