grisu

== Portuguese == === Alternative forms === grisú (1931-prescribed spelling) grisou (pre-standardization spelling) === Etymology === Borrowed from French grisou, from Walloon grisou. === Pronunciation === Hyphenation: gri‧su === Noun === grisu m (plural grisus) firedamp (inflammable gas in coal mines) === References === === Further reading === “grisu”, in Dicionário Aulete Digital (in Portuguese), Rio de Janeiro: Lexikon Editora Digital, 2008–2026