Physics
1
- (of electromagnetic radiation) having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays【物理】（电磁辐射）紫外（线）的。
1.1
- (of equipment or techniques) using or concerned with this radiation（设备, 技术）产生紫外线的; 利用紫外线的：
an ultraviolet telescope.
紫外望远镜。
mass noun
- the ultraviolet part of the spectrum; ultraviolet radiation紫外光; 紫外辐射。
Ultraviolet radiation spans wavelengths from about 10 nm to 400 nm, and is an important component of sunlight, although the ozone layer prevents much of it from reaching the earth's surface. While ultraviolet is necessary for the production of vitamin D2 in the skin, it is now known that excessive exposure can be harmful, causing skin cancer and genetic mutation.