| iso- or (before a vowel) is- | |
| —combining form | |
| 1. | equal or identical: isomagnetic |
| 2. | indicating that a chemical compound is an isomer of a specified compound: isobutane; isocyanic acid |
| [from Greek isos equal] | |
| is- or (before a vowel) is- | |
| —combining form | |
| [from Greek isos equal] | |
is- pref.
Variant of iso-.