Homoousian /(?)/

Ho·mo·ou·si·an

Homoousian

n.
  1. One of those, in the 4th century, who accepted the Nicene creed, and maintained that the Son had the same essence or substance with the Father; -- opposed to homoiousian. (Eccl. Hist.)

Homoousian

a.
  1. Of or pertaining to the Homoousians, or to the doctrines they held.