radiance
n.
c.1600, "brilliant light," from radiant or else from Medieval Latin radiantia "brightness," from radiare "to beam, shine" (see radiation). Figurative use from 1761. Related: Radiancy.
〔李〕[radi;-ancen.] n.发光； 光辉； 容光焕发； 辐射性能 ←radi (L radius)=spoke of a wheel 轮辐