Having the color and iridescence of an opal; milky-white like an opal.
The Century Dictionary (Public Domain)
Use "opalesque" in a sentence
"The next morning we came in view of Suakim, the city of white coral, with her surf-beaten opalesque reefs stretching as far as the eye could follow."
""A study of color" indeed -- a study in wonderful harmonies of vivid blues and opalesque pinks, amethysts and greens, indigoes and lakes, all the gem-like tints breaking up into sparkling fragments every moment, to reset themselves the next instant in"
"The soft padding of unseen feet, the rustling of leaves and grasses to the passage of fierce beasts, the sheen of opalesque eyes flaming through the dark, the million sounds which proclaimed the teeming life that one might hear and scent, though seldom see, constituted the appeal of the nocturnal jungle to Tarzan."