Obs. Also syno(u)siast. [ad. mod.L. synūsiasta, ad. Gr. συνουσιαστής, f. σύν SYN- + σὐσία being, substance. Cf. METUSIAST.] a. An adherent of a sect that held that in Jesus Christ there was a commingling of the divine substance and the substance of human flesh. b. A believer in consubstantiation.
1585–7. T. Rogers, 39 Art., xxviii. § 4 (1625), 176. The Synusiastes, or Vbiquitaries, which think the body of Christ is so present in the Supper, as his said Body with bread and Wine,… of all, and euery communicant, is eaten corporally.
1674. Hickman, Quinquart. Hist., Ep. (ed. 2), a 5 b. Convince a Protestant, that any one place of Scripture must needs be so understood as to assert Consubstantiation, he becomes a Synousiast forthwith.
1728. Chambers, Cycl., Synusiasts, or Synosiasts, a Sect of Hereticks, who maintain’d, that there was but one single Nature, and one single Substance in Jesus Christ.
