\ɐtˈɛnjuːˌe͡ɪtɪd vˈa͡ɪɹəs], \ɐtˈɛnjuːˌeɪtɪd vˈaɪɹəs], \ɐ_t_ˈɛ_n_j_uː_ˌeɪ_t_ɪ_d v_ˈaɪ_ɹ_ə_s]\
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A virus, or pathogenic microorganism, so modified by heat, cultivation under unfavorable conditions, etc., as to be incapable of producing the specific disease, yet exciting to the production of protective antibodies.
By Stedman, Thomas Lathrop
By Willam Alexander Newman Dorland