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neencephalon
From The Collaborative International Dictionary of English v.0.48:
neencephalon \ne`en*ceph"a*lon\ (n[=e]`[e^]n*s[e^]f"[.a]*l[o^]n), (Anat.) The most recently evolved part of the brain of higher animals. It includes the cerebral cortex and related structures. [PJC]

