microparticle; atom; molecule
Scientific term for very small particles, including atoms and molecules. Used in physics and chemistry contexts.
We conducted an experiment to observe the movement of microparticles.
This theory explains interactions at the microparticle level.
Compound of 微 (び, 'minute, tiny') and 分子 (ぶんし, 'molecule, particle'). The exact origin is uncertain, but it likely arose in scientific contexts to refer to very small particles.