tachysterol
(redirected from ertacalciol)Also found in: Medical, Encyclopedia.
ta·chys·ter·ol
(tə-kĭs′tə-rôl′, -rōl′)n.
An inactive compound, C28H44O, that is formed by irradiation of a precursor of vitamin D3 and can be converted back into that precursor.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.