homoiousian (adj.) Look up homoiousian at Dictionary.com
1680s, "having a similar nature," from Greek homoiousios "of the same essence," from homos "one and the same" (see homo- (1)) + ousia "essence" (see Parousia). As a noun from 1732 in reference to the followers of the semi-Arian Eusebius, "who maintained that the nature of Christ is similar to, but not the same with, that of the father" [Century Dictionary].