- Arius - a Greek who was a Christian theologian active in Alexandria and who was declared a heretic for his doctrines about God (which came to be known as Arianism) (256?-336)
--1 is a kind of theologian, theologist, theologizer, theologiser
- Arius, genus Arius - type genus of the Ariidae: sea catfishes
--2 is a kind of fish genus
--2 is a member of Ariidae, family Ariidae
--2 has members: crucifix fish - Arius, genus Arius - type genus of the Ariidae: sea catfishes