1. 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) • Instance Hypernyms: theologian, theologist, theologizer, theologiser 2. type genus of the Ariidae: sea catfishes • Syn: genus Arius • Hypernyms: fish genus • Member Holonyms: Ariidae, family Ariidae • Member Meronyms: crucifix fish