chromatic

adjective8

1. •
   Characterized or caused by, or relating to, colour or hue.
2. •
   Relating to or using notes not belonging to the diatonic scale of the key in which a passage of music is written.
3. •
   Moving in semitones.
4. •
   Brightly coloured; colourful, vivid.
5. •
   Having the capacity to separate spectral colours by refraction.
6. •
   Relating to chromatin (a complex of DNA, RNA, and proteins within the cell nucleus out of which chromosomes condense during cell division).

   • The chromatic threads next arrange themselves in the equatorial plane of the nucleus, and then divide into two groups of threads, each of which forms a daughter nucleus. — 1889
7. •
   Relating to colorings of graphs.
8. •
   (historical) One of three types of tetrachord (the others being the diatonic and enharmonic), with an interval between half and four-fifths of the total interval of a tetrachord.