Biol. [f. Gr. ἀχρώματ-ος uncolored + -IN, repr. Gr. -ινη female descendant, hence, derivative.] Tissue that is not stained by coloring matter when immersed in it.
1882. J. T. Cunningham, in Jrnl. Microsc. Sc., Jan., 37. Flemming concludes from this that the nucleus is composed of two substances, of which one is stained by dyes, the other not, and he accordingly calls the former chromatin, the latter achromatin.
1882. Gilburt, in Jrnl. Quek. Cl., Ser. II. No. 1. 33. The two daughter nuclei now approach each other somewhat, the achromatin bulging out between them.
