murexanChem.|ˈmjʊərɛksən| Also murexane. [f. murex + -an.] Purpuric acid. 1838R. D. Thomson in Brit.Ann. for 1839 (ed. R. D. Thomson) 384 Murexan. When murexid is dissolved in boiling water, and the solution mixed with muriatic [etc.].1841Penny Cycl. XIX. 135/2 Murexane.