pharmaceutical UK /ˌfɑː.məˈs(j)uː.tɪ.kl̩/US /ˌfɑɹ.məˈs(j)u.tɪ.kl̩/adjective 1noun 1forms 1 adjective1 •Of or relating to pharmacy or pharmacists.The company specializes in pharmaceutical research.She works for a major pharmaceutical firm. noun1 •A pharmaceutical or pharmacological preparation or product; a drug. formspharmaceuticals