Definition of universe of field of fractions (lost in translation)

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I need to find a definition of the universe (ger. Grundmenge) of the field of fractions $Quot(R)$ (ger. Quotientenkörper) of integral domain $R$. The full version is "die Grundmenge des Quotientenkörpers", maybe it's indivisible in translation. The only thing that comes to my mind so far is $$M=\{a:a\in R \vee a^{-1}\in R\}$$