STRATUM ZONALE
\stɹˈɑːtəm zˈə͡ʊne͡ɪl], \stɹˈɑːtəm zˈəʊneɪl], \s_t_ɹ_ˈɑː_t_ə_m z_ˈəʊ_n_eɪ_l]\
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(1) A mass of white substance covering the upper surface of the thalamus and forming part of the floor of the central portion of the lateral ventricle; (2) A layer of white substance seen on the surface of a section of the lamina quadrigemina.
By Stedman, Thomas Lathrop