Pronunciation: (ak"ru-mat'ik, ā"kru-), [key]
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.