D defs.my
Entry 1 sense Webster, 1913

Cation

/kătʹ-ī-ən/ · Cat·i·on · IPA /ˈkætˌaɪ.ən/
01 n. a positively charged atom, radical, or molecule, which in electrolysis migrates to the cathode; a positive ion; -- opposed to anion.
  1. 1.
    a positively charged atom, radical, or molecule, which in electrolysis migrates to the cathode; a positive ion; -- opposed to anion.(Chem.)