— achromatically , adv.
/ak'reuh mat"ik, ay'kreuh-/ , adj.
1. Optics.
a. free from color.
b. able to emit, transmit, or receive light without separating it into colors.
2. Biol. (of a cell structure) difficult to stain.
3. Music. without accidentals or changes in key.
[ 1760-70; A- 6 + CHROMATIC ]