- representing correctly the relations of colors as found in a subject; isochromatic.
- (of an emulsion) sensitive to all visible colors except red; isochromatic.
- photog of or relating to an emulsion giving a rendering of relative light intensities of different colours that corresponds approximately to the colour sensitivity of the eye, esp one that is insensitive to red lightSometimes shortened to: ortho Compare panchromatic
- Staining with the same color as that of the dye used. Used of a cell or tissue.