opalescent
adjective literary uk/ˌəʊ.pəlˈes.ənt/ us/ˌoʊ.pəlˈes.ənt/
乳色的;发乳光的;像蛋白石的;色彩变幻的
Something that is opalescent reflects light and changes colour like an opal.
the opalescent scales of a fish 像蛋白石一样发光变色的鱼鳞
Compare: iridescent