INTRINSIC FACTOR
\ɪntɹˈɪnzɪk fˈaktə], \ɪntɹˈɪnzɪk fˈaktə], \ɪ_n_t_ɹ_ˈɪ_n_z_ɪ_k f_ˈa_k_t_ə]\
Definitions of INTRINSIC FACTOR
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a substance produced by the mucosa of the stomach and intestines that is essential for the absorption of vitamin B12; "lack of intrinsic factor can result in pernicious anemia"
By Princeton University