methamphetamine hydrochloride /ˌmɛθamˈfɛtəmiːn ˌhaɪdɹə(ʊ)ˈklɔːɹaɪd/ noun1 •The hydrochloride of the drug methamphetamine.The appropriation artist had been led to believe that he was a former speed addict, intravenous addiction to methamphetamine hydrochloride is what he remembered telling that one,[…] — 1996