atomist
noun/ˈætəmɪst/
Etymology From atom + -ist.
1
An adherent of atomism; one who believes matter is composed of elementary indivisible particles.
- What distinguished the atomists from their opponents was not the belief in tiny particles that make up matter, but the question of what separated them.2002, Phillip Ball, The Elements: A Very Short Introduction, Oxford, published 2004, page 9:
2
An adherent of the atomic theory.