The Collaborative International Dictionary
Adessenarian
Adessenarian \Ad*es`se*na"ri*an\, n. [Formed fr. L. adesse to be present; ad + esse to be.] (Eccl. Hist.) One who held the real presence of Christ's body in the eucharist, but not by transubstantiation.
Wiktionary
adessenarian
n. (context historical chiefly in the plural English) A believer in the real presence of Christ's body in the Eucharist, but not by transubstantiation.