n. 学问, 学说

[ noun ]
an informal word (abstracted from words with this ending) for some unidentified branch of knowledge
<noun.cognition>

Ology \Ol"o*gy\, n. [See {-logy}.]
A colloquial or humorous name for any science or branch of
knowledge.

He had a smattering of mechanics, of physiology,
geology, mineralogy, and all other ologies whatsoever.
--De Quincey.