molecule/ˋmɑlə͵kjul; ˈmɒlIkjuːl/n [C] the smallest unit into which a substance can be divided without losing its own chemical nature 分子: Water molecules are made of two hydrogen atoms and one oxygen atom. 水分子由两个氢原子和一个氧原子组成。 —molecular /məˋlɛkjəlɚ; məˈlekjələ or məˈlekjʊlə/adj