This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, pertaining to, or employing an azeotrope

"Its key advantage, says George Jackson, professor of chemical physics, is the ability to predict very accurately the behaviour of complex strongly-associating systems such as azeotropic refrigerant mixtures, aqueous solutions of non-ionic surfactants and strong electrolyte solutions, as well as high molecular weight components such as polymer-gas systems."

allotropic