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vitamin D1

noun
1.
a mixture of lumisterol and calciferol, obtained by ultraviolet irradiation of ergosterol.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
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