Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
stinguo, ĕre, v. a. [cf. stig; Gr. στίζω; cf. also Germ. ersticken], to quench, extinguish (poet. and very rare, for the usu. extinguo): ut cernere possis Evanescere paulatim stinguique colorem, Lucr. 2, 828: ignes stingui, id. 1, 666; so, stinguuntur radii (solis), Cic. poët. Fragm. ap. Prisc. p. 882: stinguens praeclara insignia caeli, id. ib.: ardorem membris, Lucr. 4, 1098.