cal·cif·er·ol / kalˈsifəˌrôl; -ˌrōl/ •
n. Biochem. one of the D vitamins, a sterol that is formed when its isomer ergosterol is exposed to ultraviolet light, and that is routinely added to dairy products. Also called ergocalciferol, vitamin D2 (see vitamin D).
Used at one time as a name for ercalciol (ergocalciferol or vitamin D2
), made by the ultra‐violet irradiation of ergosterol. Also used as a general term to include both vitamers
of vitamin D
A compound, designated vitamin D2
, obtained through the ultraviolet irradiation of ergosterol.