transcription, транскрипция: [ noun ]
Date: circa 1921
: any or all of several fat-soluble vitamins chemically related to steroids, essential for normal bone and tooth structure, and found especially in fish-liver oils, egg yolk, and milk or produced by activation (as by ultraviolet irradiation) of sterols: as
a. or vitamin D 2 -ˈdē-ˈtü : calciferol
b. or vitamin D 3 -ˈdē-ˈthrē : cholecalciferol