Subchromatic
The term subchromatic[idiosyncratic term] has several meanings.
- Small (commatic), nondiatonic dimensions of higher-rank extended-diatonic temeraments.
- Small, nondiatonic accidentals (regardless of whether it is tempered out or not) in some extended diatonic notations.
The term subchroma also has several meanings.
- Somewhat like chroma for subdivided interval quality, e.g. difference between artoneutral and tendoneutral.
- Interval smaller than chromatic in your context.