Webster's English Dictionary

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achromatic

ach.ro.mat.ic \.ak-r*-'mat-ik\ \-i-k(*-)le-\ \.ak-ro--m*-'tis-*t-e-\ 
   \(')a--'kro--m*-.ti-z\ aj 1: refracting light without dispersing into its 
   constituent colors : giv ing images practically free from extraneous colors 
   {an ~ telescope} 2: not readily colored by the usual staining agents  3: 
   possessing no hue : NEUTRAL : being black, gray, or white  4: being without 
   accidentals or modulation : DIATONIC  - ach.ro.mat.i.cal.ly av