Chloride/ˈklɔːraɪd/ Definition 1 of 3Pro Tip 1/3Common Compound Chloride is found in everyday substances like salt. Table salt is sodium chloride, a common compound. Pro Tip 2/3Health-Relevant Some chlorides are vital for health, others can be toxic. Potassium chloride is important for heart function. Pro Tip 3/3Not Always Salty Despite 'salt' synonym, not all chlorides taste salty. Zinc chloride is used in mouthwash but isn't edible.