ACTINIC RAY
\aktˈɪnɪk ɹˈe͡ɪ], \aktˈɪnɪk ɹˈeɪ], \a_k_t_ˈɪ_n_ɪ_k ɹ_ˈeɪ]\
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By Princeton University
By DataStellar Co., Ltd
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That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.
By DataStellar Co., Ltd
Word of the day
Stricture of the cesophagus
- Dysphagia constricta-s. of the Pharynx, constricta.