noun
(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles
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the ancient Greek philosophers Democritus and Epicurus held atomic theories of the universe
• Syn: ↑atomism, ↑atomic theory, ↑atomistic theory
• Topics: ↑chemistry, ↑chemical science
• Hypernyms: ↑theory
Useful english dictionary. 2012.