dihydroretinolWiktionary 原文英美构词拆解didi-前缀hydrohydro-前缀retinolretinol词干di-Two. · Double, twice the quantity.hydro-water · liquid词源说明From di- + hydro- + retinol.释义名词noun1(biochemistry) retinol with two hydrogen atoms added, found in human metabolism of vitamin A