The Greek Logos generates the suffix -ology for all sciences dealing with theory. The Greek logos is the root for Logic, and generates the suffix -ology as in: Being Onto-logy Light Photo-logy Sound Phon-ology World Cosm-ology Writing Graph-ology It also entails the four elements Earth Geo-logy Air Aero-logy Fire Pyro-logy Water Hydro-logy Since the 16th century there has been a gradual shift whereby the theory dimension of any discipline is characterized by the suffix Science (q.v). talk, speak, speech; words, language; tongue, etc.": cit-; clam-; dic-; fa-; -farious; glosso-; glotto-; lalo-; linguo-; locu-; logo-; loqu-; mythico-; ora-; -phasia; -phemia; phon-; phras-; Quotes: Language,Part 1; Quotes: Language, Part 2; Quotes: Language, Part 3; serm-; voc-. http://www.wordinfo.info/words/index/info/view_unit/1463/?letter=O&spage=2