viosterol


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er·go·cal·cif·er·ol

(er'gō-kal-sif'ĕr-ol),
Activated ergosterol, the vitamin D of plant origin; it arises from ultraviolet irradiation of ergosterol, which is cleaved at the 9,10 bond and develops a double bond between C-10 and C-19; used in prophylaxis and treatment of vitamin D deficiency.
Synonym(s): calciferol, ercalciol, viosterol, vitamin D2

viosterol

(vī-ŏs′tə-rôl′, -rōl′)
n.
Ergosterol activated by ultraviolet irradiation; vitamin D2.

viosterol

(vi-os'ter-ol)
A solution of irradiated ergosterol in vegetable oil. Synonym: calciferol