adj 1  :  refracting light without dispersing it into its constituent colors  :  giving images practically free from extraneous colors <an telescope>   2  :  not readily colored by the usual staining agents  3  :  possessing or involving no hue  :  being or involving only black, gray, or white < visual sensations>  < light stimuli>  ach*ro*mat*i*cal*ly adv 
 
 
 
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