hy·dro·chloride \ˌ ̷ ̷ ̷ ̷+ˈ-\noun Etymology: International Scientific Vocabulary hydrochloric + -ide : a compound of hydrochloric acid — used especially with the names of organic bases for convenience in naming salts; distinguished from chloride < pyridine hydrochloride, C5H5N.HCl is the same as pyridinium chloride, C5H6NCl >