iso- prefix definition chemistry
iso-. combining form. 1. equal or identical: isomagnetic. 2. (Chemistry) indicating that a chemical compound is an isomer of a specified compound: isobutane; isocyanic acid.[from Greek isos equal].Also, esp. before a vowel, is- .so-. combining form. 1. equal or identical: isomagnetic. 2. (Chemistry) indicating that a chemical compound is an isomer of a specified compound: isobutane; isocyanic acid. [from Greek isos equal]. Also, esp. before a vowel, is- .