chloride Salt of hydrochloric acid or some organic compounds containing chlorine, especially those with the negative ion Cl⁻. The best-known example is common salt, sodium chloride (NaCl). Most chlorides are soluble in water, except mercurous and silver chlorides.

chlo·ride / ˈklôrˌīd/ • n. Chem. a compound of chlorine with another element or group, esp. a salt of the anion Cl⁻ or an organic compound with chlorine bonded to an alkyl group.