labradorescenceEnglishOxford Dictionary of Englishlabradorescence /ˌlabrədɔːˈrɛsn(t)s / ▸ noun [mass noun] Mineralogy the brilliant iridescence exhibited by some specimens of labradorite and other feldspars. – DERIVATIVES labradorescent /ˌlabrədɔːˈrɛsnt / adjective