particle ['pɑ:tɪk(ə)l] adj.
comp., MS	粒子 (A very small piece or part; an indivisible object)
English thesaurus
particle ['pɑ:tɪk(ə)l] n
gram.	a function word that must be associated with another word or phrase to impart meaning, i.e., does not have its own lexical definition