Webster’s Revised Unabridged Dictionary · 1913 Vulcanology Vul′can·ol′o·gy (vŭl′kan·ŏl′ō·jy̆), n. [See Vulcan, and -logy.] The science which treats of phenomena due to plutonic action, as in volcanoes, hot springs, etc. [R.] ‹ Vulcano Vulgar ›