Retinol with an additional double bond in the 3-4 position of the cyclohexane ring. SYN: vitamin A2.
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de·hy·dro·ret·i·nol (de-hi″dro-retґĭ-nol) a form of vitamin A, vitamin A2, occurring with retinol in freshwater fish; it is similar in structure to retinol, but has an additional conjugated double bond and only approximately one third the biological activity.Medical dictionary. 2011.