homoousian

noun

ho·​mo·​ou·​si·​an hō-ˌmō-ˈü-zē-ən 

hä-,

-ˈü-sē-

: an adherent of an ecclesiastical party of the fourth century holding to the doctrine of the Nicene Creed that the Son is of the same substance with the Father

Word History

Etymology

Late Greek homoousios of the same substance, from Greek hom- + ousia substance — more at homoiousian

First Known Use

1565, in the meaning defined above