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vitamin D1

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noun
  1. a mixture of lumisterol and calciferol, obtained by ultraviolet irradiation of ergosterol.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for vitamin d1

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