ra·dio·lucence \|rādē(ˌ)ō|lüsən(t)s\noun orra·dio·lu·cen·cy\-nsē\ (pluralradiolucencesorradiolucencies) Etymology:radiolucence from radiolucent, after such pairs as English different : difference; radiolucency from radiolucent + -cy : the quality or state of being radiolucent