Lewis Short
(adjective) : per-fămĭlĭāris, e
* Very intimate, very familiar (class.): perfamiliaris Philisto,Cic. Q. Fr. 2, 11 (13), 4.—In tmesi: Phaedon Socrati per fuit familiaris,Gell. 2, 18, 1.
* Subst.: perfămĭlĭāris, is, m., a very intimate or familiar friend (class.): meus,Cic. Fam. 13, 51: Epicuri,id. Fin. 5, 31, 94: M. Antonii,id. Brut. 45, 168.
Charlton T. Lewis, Charles Short, A Latin Dictionary