chromatic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Relating to colors or color.
• adjective Relating to color perceived to have a saturation greater than zero.
• adjective Of, relating to, or based on the chromatic scale.
• adjective Relating to chords or harmonies based on nonharmonic tones.

from The Century Dictionary.

• Relating to or of the nature of color.
• In music: Involving tones foreign to the normal tonality of a scale, a harmony, or a piece; not diatonic, Involving the use of the black notes on the keyboard, or of sharps and flats on the staff.
• noun In music, a note affected by an accidental.
• In cytology, of or pertaining to chromatin, the stainable substance of the cell-nucleus.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Relating to color, or to colors.
• adjective (Mus.) Proceeding by the smaller intervals (half steps or semitones) of the scale, instead of the regular intervals of the diatonic scale.
• adjective (Opt.) See Aberration, 4.
• adjective printing from type or blocks covered with inks of various colors.
• adjective (Mus.) the scale consisting of thirteen tones, including the eight scale tones and the five intermediate tones.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Relating to or characterised by hue.
• adjective Having the capacity to separate spectral colours by refraction.
• adjective music Regarding all twelve traditional Western pitch classes, regardless of temperament or intonation; Regarding entire sets of alternative pitch class systems.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective able to refract light without spectral color separation
• adjective being or having or characterized by hue
• adjective based on a scale consisting of 12 semitones