ultraviolet

Từ điển WordNet v3.1 - WordNet Dictionary

I - noun

radiation lying in the ultraviolet range;
wave lengths shorter than light but longer than X rays (Freq. 3)
• Syn:
ultraviolet radiation, ultraviolet light, ultraviolet illumination, UV
• Hypernyms:
actinic radiation, actinic ray
• Hyponyms:
sunray, sun-ray

II - adjective

having or employing wavelengths shorter than light but longer than X-rays;
lying outside the visible spectrum at its violet end (Freq. 2)
- ultraviolet radiation
- an ultraviolet lamp
• Similar to:
invisible, unseeable