noun
an adherent of an originally 4th- and 5th-cent. theory asserting the existence of only one nature (divine or divine-human) in Christ and opposing the orthodox doctrine of the existence of two distinct natures (one wholly divine, the other wholly human) in the one person of Christ
Origin:
LGr(Ec) monophysitēs < Gr monos, single (see mono-) + physis, nature (see physic)