Wiktionary
reaction mixture
n. 1 (context chemistry English) A product of the act or process or an instance of mix and react (combine) two or more substances together causing reaction(s); mixture causing chemical transformation or change; the interaction of entities : 2 # the state resulting from such a reaction 3 #a process involving change in atomic nuclei 4 A product formed by the combination of two or more elements, compounds or substances together causing reactions and transformation of original items or substances.