| 释义 |
opaque medium opaque medium[ō′pāk ‚mēd·ē·əm] (optics) A medium impervious to rays of light, that is, not transparent to the human eye. (physics) A medium which does not transmit electromagnetic radiation of a specified type, such as that in the infrared, x-ray, ultraviolet, and microwave regions. A medium which prevents the passage of particles of a specified type. |