Correct spelling for the English word "melubrin" is [mˈɛluːbɹˌɪn], [mˈɛluːbɹˌɪn], [m_ˈɛ_l_uː_b_ɹ_ˌɪ_n] (IPA phonetic alphabet).
A synthetic drug, the sodium salt of 1-phenyl-2, 3-dimethyl-5-pyrazolon-4-aminomethane-sulphonic acid; antipyretic and analgesic, recommended in the treatment of neuralgia and acute articular rheumatism in doses of gr. 15-30 (1.0-2.0).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.