noun, plural ologies. Informal or Facetious.
any science or branch of knowledge.

1795–1805; extracted from words like biology, geology where the element -logy is preceded by -o-; see -o-

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World English Dictionary
ology (ˈɒlədʒɪ)
n , pl -gies
informal a science or other branch of knowledge
[C19: abstracted from words with this ending, such as theology, biology, etc; see -logy]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Theology is about as valid as field of study as unicorn-ology or invisible pink dragon-ology.
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