utraquism

from The Century Dictionary.

• noun The doctrines of the Utraquists or Calixtines, whose chief tenet was that communicants should partake in both kinds (that is, of the cup as well as of the bread) in the Lord's Supper. See Calixtine.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The doctrine of the obligation of the faithful to receive communion in both kinds (sub utraque specie).