Arniensis
Could not find Arniensem in Logeion dictionaries.
Arniensem Proper-name adjective: masculine accusative singular, Proper-name adjective: feminine accusative singular of Arniensis
Arniensis, e, v. Arnus.
Arniēnsis, s. Arnus.
Arnĭēnsis, (15) e, de lʼArno [nom dʼune tribu de Rome] : Cic. Agr. 2, 79 ; Liv. 6, 5, 8.