What is the Latin word for transubstantiation?

The usual Latin words for “transubstantiation” are trānsubstantiātiō, immūtātiō, permūtātiō. The right choice depends on the sense; see the distinctions below.

English → Latin

“transubstantiation” in Latin

trānsubstantiātiōtransubstantiation immūtātiōchange, alteration; substitution, replacement permūtātiōchange, alteration; exchange, barter

The English word transubstantiation itself goes back to Latin substantia, through trānsubstantiātiō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

transubstantiation

*transubstantiatio (technical term, ecclesiastical): *immutatio: permutatio (ficta, commentitia).

Quick answer

What is the Latin word for transubstantiation?: The usual Latin words for “transubstantiation” are trānsubstantiātiō, immūtātiō, permūtātiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.