Entry 3 senses · 2 variants Webster, 1913 Vesuvian · Ve·su·vi·an · IPA a. n. 01 a. Of or pertaining to Vesuvius, a volcano near Naples. 1. Of or pertaining to Vesuvius, a volcano near Naples. 02 n. Vesuvianite. 1. Vesuvianite.(Min.) 2. A kind of match or fusee for lighting cigars, etc.