verb (used with object), transubstantiated, transubstantiating.
to change from one substance into another; transmute.
Theology. to change (the bread and wine) into the body and blood of Christ in the Eucharist.
Origin: 1400–50; Related forms
v. use of late Middle English transsubstanciate
(adj.) transubstantiated < Medieval Latin trānssubstantiātus,
past participle of trānssubstantiāre.