<p><strong>Adjective:</strong></p><ul><li>Pertaining to or involving atomic weapons: nuclear war.</li><li>Operated or powered by atomic energy: a nuclear submarine.</li><li>(Of a nation or group of nations) having atomic weapons.</li><li>Of, relating to, or forming a nucleus.</li><li>Of, relating to, or like the nuclear family: nuclear bonds.</li></ul><p><strong>Noun:</strong></p><ul><li>Informal. Nuclear energy: switching to nuclear as a power source.</li></ul>