A Christian theological doctrine teaching that Christ had a divine mind but a human body and lower soul, rejecting the idea that He had a fully human rational mind.
From Apollinarius of Laodicea and the suffix '-ism,' formed to describe the specific heretical theology he proposed in the 4th century.
Apollinarianism was declared heretical because it made Christ less than fully human—ironically, the Church's official position that He was completely God AND completely human is actually harder to explain logically!
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