- Optics.
- free from color.
- able to emit, transmit, or receive light without separating it into colors.
- (of a cell structure) difficult to stain.
- without accidentals or changes in key.
- without colour
- capable of reflecting or refracting light without chromatic aberration
- cytology
- not staining with standard dyes
- of or relating to achromatin
- music
- involving no sharps or flats
- another word for diatonic
- denoting a person who is an achromat
