OFFICIAL FORMULA

\əfˈɪʃə͡l fˈɔːmjʊlə], \əfˈɪʃə‍l fˈɔːmjʊlə], \ə_f_ˈɪ_ʃ_əl f_ˈɔː_m_j_ʊ_l_ə]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
  • A f. (2nd def.)
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe