-logy

·- A combining form denoting a discourse, treatise, doctrine, theory, science; as, theology, geology, biology, mineralogy.

Logy
·adj Heavy or dull in respect to motion or thought; as, a logy horse. ...

Webster's Dictionary of the English Language
logy
(Dutch, log, heavy, slow, unwieldy.) We have received this word from the Dutch, and apply it general...

Dictionary of American Words And Phrases by John Russell Bartlett.