Entry 2 senses · 2 variants Webster, 1913 Brimstone /brĭm'-stōn/ · Brim·stone · IPA /ˈbɹɪmstoʊn/ n. a. 01 n. Sulphur; See Sulphur. 1. Sulphur; See Sulphur. See: Sulphur 02 a. Made of, or pertaining to, brimstone; as, brimstone matches. 1. Made of, or pertaining to, brimstone; as, brimstone matches. “From his brimstone bed at break of day A-walking the devil has gone.” — Coleridge.