The Collaborative International Dictionary
Isochromatic
Isochromatic \I`so*chro*mat"ic\, a. [Iso- + chromatic.] (Opt.) Having the same color; connecting parts having the same color, as lines drawn through certain points in experiments on the chromatic effects of polarized light in crystals.
Wiktionary
isochromatic
a. 1 (context optics English) Having the same colour or wavelength. 2 Of or corresponding to constant colour. 3 Of uniform colour.