PRIMORDIAL LAYERS

\pɹɪmˈɔːdɪəl lˈe͡ɪəz], \pɹɪmˈɔːdɪəl lˈe‍ɪəz], \p_ɹ_ɪ_m_ˈɔː_d_ɪ__ə_l l_ˈeɪ_ə_z]\

Definitions of PRIMORDIAL LAYERS

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1916 - Appleton's medical dictionary
By Smith Ely Jelliffe