Ergosterol activated by ultraviolet irradiation; vitamin D2.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "viosterol" in a sentence
"We looked for other ways and we found that the active principle in cod liver oil was viosterol."