tachysterol

(ta kistər ôl′, -ōl′)

noun

an isomer of ergosterol, CHO, formed during the production of calciferol by the irradiation of ergosterol

Origin: tachy- + sterol

See tachysterol in American Heritage Dictionary 4

noun
An isomer of ergosterol that forms vitamin D2 when irradiated with ultraviolet light.

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