pervasor

pervādō +‎ -tor

• (Classical) IPA^(key): /perˈu̯aː.sor/, [pɛrˈu̯äːs̠ɔr]
• (modern Italianate Ecclesiastical) IPA^(key): /perˈva.sor/, [perˈväːs̬or]

pervāsor m (genitive pervāsōris); third declension (Late Latin, Medieval Latin)

1. invader

   Synonym: invāsor

2. usurper
   • c. 870, Anastasius Bibliothecarius, transl., Gesta sanctae ac universalis octavae synodi […], actio 7:

     Jam manifestum est, o dilectissimi fratres et consacerdotes, in praecedenti actione hujus sanctae ac magnae synodi, quomodo admonitus sit Photius forensis et curialis, et pervasor Constantinopolitanae ecclesiae […]

     Now it is evident, dearest brothers and fellow-priests, in the previous transaction of this holy and great synod, in what manner Photius the layman and courtier, the usurper of the Constantinopolitan Church, is to be admonished […]

Third-declension noun.

• “pervasor”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• pervasor in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• pervasor in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Niermeyer, Jan Frederik (1976) “pervasor”, in Mediae Latinitatis Lexicon Minus, Leiden, Boston: E. J. Brill, page 795