Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to achromatin: Tuit
The weakly staining components of the nucleus, such as the nuclear sap and euchromatin.
achromatin/achro·ma·tin/ (ah-kro´mah-tin) the faintly staining groundwork of a cell nucleus.
The part of a cell nucleus that remains less colored than the rest of the nucleus when stained or dyed.