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vitamin D1

noun

  1. a mixture of lumisterol and calciferol, obtained by ultraviolet irradiation of ergosterol.

vitamin D1

noun

  1. the first isolated form of vitamin D, consisting of calciferol and its precursor, lumisterol
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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vitamin Dvitamin D2

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