The American Heritage® Dictionary of the English Language, 4th Edition
n. The doctrine, proposed by Martin Luther, that the substance of the body and blood of Jesus coexists with the substance of the bread and wine in the Eucharist.
n. The actual, substantial presence of the body of Christ with the bread and wine of the sacrament of the Lord's Supper; impanation, as opposed to transubstantiation.
the GNU version of the Collaborative International Dictionary of English
n. An identity or union of substance.
n. The actual, substantial presence of the body of Christ with the bread and wine of the sacrament of the Lord's Supper; impanation; -- opposed to transubstantiation.
The Century Dictionary and Cyclopedia
n. The doctrine that the body and blood of Christ coexist in and with the elements of the eucharist, although the latter retain their nature as bread and wine: opposed to the Roman Catholic doctrine of transubstantiation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the doctrine of the High Anglican Church that after the consecration of the Eucharist the substance of the body and blood of Christ coexists with the substance of the consecrated bread and wine
Word Usage
"The Lutherans maintained what they called consubstantiation, that Christ was _with_ and _in_ the bread and wine, as fire is in a hot iron, to borrow the metaphor of Luther himself."