particle

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par|ti|cle /p'ɑːrtɪkəl/ (particles)
1 [N-COUNT] oft N of n
A particle of something is a very small piece or amount of it.
There is a particle of truth in his statement.
...food particles.
2 [N-COUNT]
In physics, a particle is a piece of matter smaller than an atom, for example an electron or a proton. (TECHNICAL)
3 [N-COUNT]
In grammar, a particle is a preposition such as `into' or an adverb such as `out' which can combine with a verb to form a phrasal verb.par|ti|cle ac|cel|era|tor (particle accelerators)
[N-COUNT]
A particle accelerator is a machine used for research in nuclear physics which can make particles that are smaller than atoms move very fast.par|ti|cle phys|ics
[N-UNCOUNT]
Particle physics is the study of the qualities of atoms and molecules and the way they behave and react.

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