[ ˌhɒməʊ'u:sɪən , -'aʊ- , -z- , ˌhəʊməʊ- ]
(also homousian )
■ noun historical a person who held that God the Father and God the Son are of the same substance. Compare with homoiousian .
Origin
C16: via eccles. L. homousianus , from Gk homoousios , from homos 'same' + ousia 'essence, substance'.