\ˈɒptɪks], \ˈɒptɪks], \ˈɒ_p_t_ɪ_k_s]\
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- 2006 - WordNet 3.0
- 2011 - English Dictionary Database
- 2010 - New Age Dictionary Database
- 1913 - Webster's Revised Unabridged Dictionary
- 1920 - A practical medical dictionary.
- 1894 - The Clarendon dictionary
- 1919 - The Concise Standard Dictionary of the English Language
- 1914 - Nuttall's Standard dictionary of the English language
- 1874 - Etymological and pronouncing dictionary of the English language
- 1898 - American pocket medical dictionary
- 1916 - Appleton's medical dictionary
- 1871 - The Cabinet Dictionary of the English Language
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By Princeton University
By DataStellar Co., Ltd
By Oddity Software
By Noah Webster.
The science which treats of the properties of light, its refraction, absorption, etc., and of refracting media, especially of the eye in that relation.
By Stedman, Thomas Lathrop
By William Hand Browne, Samuel Stehman Haldeman
By James Champlin Fernald
By Nuttall, P.Austin.
By Stormonth, James, Phelp, P. H.
By Willam Alexander Newman Dorland
Word of the day
- 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.