\ɹˈɛtəbə͡l], \ɹˈɛtəbə‍l], \ɹ_ˈɛ_t_ə_b_əl]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson
1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry

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  • Preparations of pathogenic organisms or their derivatives made nontoxic and intended for active immunologic prophylaxis. They include deactivated toxins.
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