an·gel·ol·o·gy /ˌenʤəˈlɑləʤi/
天使學
An·gel·ol·o·gy n. A discourse on angels, or a body of doctrines in regard to angels.
The same mythology commanded the general consent; the same angelology, demonology. --Milman.
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angelology
n : the branch of theology that is concerned with angels