QUINIDIA
\kwɪnˈɪdi͡ə], \kwɪnˈɪdiə], \k_w_ɪ_n_ˈɪ_d_iə]\
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An alkaloid of the cinchonas -of many of the genuine at least-obtained from them by the same process as that by which quinia is obtained from the barks that yield it. Its sulphate is more soluble however than the sulphate of quinia, and it is left, therefore, in the mother waters. The salts of quinidia are markedly antiperiodic. From gr. x to gr. will usually arrest a paroxysm.
By Robley Dunglison