(philosophy) The ancient Greek theory that all matter is composed of very small indestructible and indivisible particles.

plural of atomism

(computing) An atomic operation.

(physics, chemistry) Of or relating to atoms; composed of atoms; monatomic. / Employing or relating to nuclear energy or processes. / Infinitesimally small.

(chemistry, physics) The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

With regard to atoms or atomic energy.

An instrument for reducing a liquid to spray or vapor for disinfecting, cooling, medical use or perfume spraying.

plural of atom

(uncountable) The quality or state of being atomic. / (chemistry) The number of atoms in a molecule.

The act or an instance of atomizing.