Entry 1 sense Webster, 1913 Vulcan /vŭl'-kən/ · Vul·can · IPA /ˈvʌlkən/ 01 n. The god of fire, who presided over the working of metals; -- answering to the Greek Hephaestus. 1. The god of fire, who presided over the working of metals; -- answering to the Greek Hephaestus.(Rom. Myth.)