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vitamin D1

American  

noun

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

vitamin D1 British  

noun

  1. the first isolated form of vitamin D, consisting of calciferol and its precursor, lumisterol

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.