ultraviolet radiation

Từ điển WordNet v3.1 - WordNet Dictionary

noun

radiation lying in the ultraviolet range;
wave lengths shorter than light but longer than X rays (Freq. 2)
• Syn:
ultraviolet, ultraviolet light, ultraviolet illumination, UV
• Derivationally related forms:
ultraviolet (for: ultraviolet)
• Hypernyms:
actinic radiation, actinic ray
• Hyponyms:
sunray, sun-ray