We don't have synonyms for azeotropes yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are azeotrope, allotropes and azeotropic.
(n) :
(physics) A mixture of two or more substances whose liquid and gaseous forms have the same composition (at a certain pressure); the substances cannot be separated by normal distillation.
(n) :
(physics) A mixture of two or more substances whose liquid and gaseous forms have the same composition (at a certain pressure); the substances cannot be separated by normal distillation.