Pronunciation: (klôr'u-nāt", klōr'-),[key] —v.t.,-nat•ed, -nat•ing. 1. Chem. a. to combine or treat with chlorine.
b. to introduce chlorine atoms into an organic compound by an addition or substitution reaction.
2. to disinfect (water) by means of chlorine.
3. Metall.to treat (a gold ore) with chlorine gas in order that the gold may be removed as a soluble chloride.