LANDOLT'S OPERATION
\lˈandə͡ʊlts ˌɒpəɹˈe͡ɪʃən], \lˈandəʊlts ˌɒpəɹˈeɪʃən], \l_ˈa_n_d_əʊ_l_t_s ˌɒ_p_ə_ɹ_ˈeɪ_ʃ_ə_n]\
Word of the day
Ultraviolet Ray
- That portion electromagnetic spectrum immediately below visible range extending into x-ray frequencies. longer near-biotic vital necessary for endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic extravital rays) viricidal, bactericidal, mutagenic, carcinogenic used as disinfectants.