n. 天使学

[ noun ]
the branch of theology that is concerned with angels
<noun.cognition>

Angelology \An`gel*ol"o*gy\, n. [L. angelus, Gr. ? + -logy.]
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.