Definition of "transubstantiation"

transubstantiation

noun
countable and uncountable, plural transubstantiations
1. (Roman Catholicism) The doctrine holding that the bread and wine of the Eucharist are essentially transformed into the body and blood of Jesus.
  Quotations
  I was openly dismissive about transubstantiation, by which the host is consecrated, and according to Catholic doctrine, literally turns from mere bread into the body of Christ. “But all the atoms stay the same!” I would insist. “That makes no sense!”
  2020 July 6, Helen Lewis, “How J. K. Rowling Became Voldemort”, in The Atlantic‎
2. (by extension) Conversion of one substance into another.