(physics, chemistry) the equivalent of an atom in which either the nucleus, or an electron, is replaced by some other subatomic particle

(uncommon) Nuclear winter.

(physics) a hydrogen-like system consisting of an ordinary nucleus with a hadron in orbit.

The era, starting in the mid-1940s, during which nuclear energy was developed, and in which it was thought that all energy would be provided by such sources.

(physics) any device that converts the energy of particles emitted from atomic nuclei into electrical energy

(physics, chemistry) Any atom which has a single valence electron in a shell well outside any other electrons in the aton; approximates the hydrogen atom.

Alternative spelling of subatomic

Alternative spelling of subatomic

A nuclear weapon.

(physics) The theory that all gross matter is composed of atoms. / (physics) Any of several theories that explain the structure of the atom, and of subatomic particles.