polychromatophil

from The Century Dictionary.

• Having an affinity for more than one dye; taking both acid and basic stains: noting especially certain degenerated or immature forms of red blood-corpuscles.
• noun A degenerated or immature form of red blood-corpuscle which stains not only in the presence of the acid dyes, as does the normal cell, but also in that of the basic dyes.