FACULTATIVE AEROBION

\fˈakəltətˌɪv ˈe͡əɹə͡ʊbˌɪən], \fˈakəltətˌɪv ˈe‍əɹə‍ʊbˌɪən], \f_ˈa_k_ə_l_t_ə_t_ˌɪ_v ˈeə_ɹ_əʊ_b_ˌɪ__ə_n]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland