achromatin
/aˈkrəʊmatɪn/ /eɪˈkrəʊmatɪn/Cell Biol.
noun
The nuclear material in a eukaryotic cell which does not readily stain with basic dies. Opposed to chromatin.
Origin
Late 19th century. From German Achromatin from ancient Greek ἀχρώματος uncoloured + -in.