Term: combination electrode https://doi.org/10.1351/goldbook.C01184 Definition: An ion-selective electrode and an external reference electrode combined in a single unit, thereby avoiding the need for a separate external reference electrode. Related Terms: 1) ion-selective electrode (http://doi.org/10.1351/goldbook.I03244). 2) reference electrode (http://doi.org/10.1351/goldbook.R05229). Source: PAC, 1994, 66, 2527. 'Recommendations for nomenclature of ionselective electrodes (IUPAC Recommendations 1994)' on page 2528 (https://doi.org/10.1351/pac199466122527) Citation: 'combination electrode' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.C01184 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.