Collins Concise English Dictionary © HarperCollins Publishers::

prosencephalon /ˌprɒsɛnˈsɛfəlɒn/ n ( pl -la / -lə/)
  1. the part of the brain that develops from the anterior portion of the neural tube
    Nontechnical name: forebrain
Etymology: 19th Century: from New Latin, from Greek prosō forward + enkephalos brain

'prosencephalon' also found in these entries:
In the English description:

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