achromatophil

< /ˌeɪ krəˌmæt əˈfɪl ɪk, ˌæk rə-, eɪˌkroʊ mə tə-/. having little or no affinity for stains.

noun

2. an achromatophil cell or tissue.

adj.

1. Not able to be colored by histological or bacteriological stains.

n.

1. A cell or tissue that cannot be stained in the usual way.