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my·el·en·ceph·a·lon .mī-ə-len-'sef-ə-.län, -lən n the posterior part of the developing vertebrate hindbrain or the corresponding part of the adult brain composed of the medulla oblongata
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n.
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my·el·en·ceph·a·lon (mi″əl-en-sefґə-lon) [myel- + encephalon] 1. [TA] medulla oblongata. 2. the posterior of the two brain vesicles formed by specialization of the rhombencephalon in the developing embryo.Medical dictionary. 2011.