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vitamin D1

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