Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

ology
     n : an informal word (abstracted from words with this ending)
         for some unidentified branch of knowledge