atomic theory
noun
mass noun
1- the theory that all matter is made up of tiny indivisible particles (atoms). According to the modern version, the atoms of each element are effectively identical, but differ from those of other elements, and unite to form compounds in fixed proportions.原子论（认为所有物质都由微小的、不可分割的粒子构成。根据现代理论, 同种元素的原子相同, 不同元素的原子不同, 原子按一定的比例结合而形成化合物）。
1.1
- count noun a theory in any field which proposes the existence of distinct, separable, independent components原子说（主张物质由不同的、可分离的、独立的成分构成）：
an atomic theory of heredity.
遗传原子学说。