rhigoleneChem.|ˈrɪgəʊliːn| [f.Gr. ῥῖγος cold + L. ol-eum oil + -ene.] The lightest and most volatile liquid obtained from petroleum, used to produce local anæsthesia. 1866Chem. News XIII. 244/2 Rhigolene, a Petroleum Naphtha for Producing Anæsthesia by Freezing, by Henry J. Bigelow, M.D.