D defs.my
Entry 1 sense Webster, 1913

Anion

/ăn'-ī-ŏn/ · An·i·on · IPA /ˈænˌaɪ.ən/
01 n. An electro-negative atom or group of atoms, or the element which, in electro-chemical decompositions, is evolved at the anode; -- opposed t…
  1. 1.
    An electro-negative atom or group of atoms, or the element which, in electro-chemical decompositions, is evolved at the anode; -- opposed to cation.(Chem.) See: cation