Learn how to say Consubstantiation correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word consubstantiation:
(Christian theology, in the belief of High-Church Anglicans)
the doctrine that after the consecration of the Eucharist the substance of the body and blood of Christ coexists within the substance of the consecrated bread and wine
the mystical process by which this is believed to take place during consecration