agnātus m (genitive agnātī); second declension
- A relative connected through the male line; an agnate
- (law) An afterborn son, born after his father had made a will
- agnatus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
- Institutes of Gaius, AD 161, defines in detail the civil law meaning of agatus of ancient Rome. A translation by M. H. Crawford is in Roman Statutes, 1996.