n.[C]

1. 微粒；顆粒[（+of）]
   Particles of dirt settled on the tablecloth.

   塵埃落在臺布上。

2. 極小量[（+of）]
   There is not a particle of truth in his report.

   他的報告沒有一點真實性。

3. （物）粒子，質點
   He is studying the properties of these particles.

   他在研究這些粒子的性質。

4. 【文】質詞（包括某些副詞，冠詞，介系詞，連接詞等）；字首，字尾

n.

1. a minute portion of matter.
2. Physics  a subatomic constituent of the physical world, e.g. an electron, proton, neutrino, or photon.
3. Grammar  a minor function word that has comparatively little meaning and does not inflect, e.g. in, up, off, or over used with verbs to make phrasal verbs.