HOMOIOUSIAN

[ho.moi.ou.si.an] n [LGk homoiousios of like substance, fr. Gk homoi- homeo- + ousia essence, substance, fr. ont-, on, prp. of einai to be--more at is] (1732): an adherent of an ecclesiastical party of the 4th century holding that the Son is essentially like the Father but not of the same substance