/'aɪən; [US] also 'aɪɒn; `aɪɒn/
n (chemistry or physics 化或物) electrically charged particle resulting from the breakdown of atoms through solution in water and making this solution a conductor of electricity 离子.

n[C]technical
[Date: 1800-1900; Language: Greek;Origin: , present participle of ienai 'to go']
an atom which has been given a positive or negative force by adding or taking away an electron