Main Entry: ach·ro·mat·ic

Pronunciation: \ˌa-krə-ˈma-tik, (ˌ)ā-\

Function: adjective

Date: 1766

1 : refracting light without dispersing it into its constituent colors : giving images practically free from extraneous colors <an achromatic telescope>
2 : not readily colored by the usual staining agents
3 : possessing no hue : being or involving black, gray, or white : neutral <achromatic visual sensations>
4 : being without accidentals or modulation : diatonic

— ach·ro·mat·i·cal·ly \-ti-k(ə-)lē\ adverb

— achro·ma·tism \(ˌ)ā-ˈkrō-mə-ˌti-zəm, a-\ noun

— achro·ma·tize \(ˌ)ā-ˈkrō-mə-ˌtīz, a-\ transitive verb