WordReference Random House Unabridged Dictionary of American English © 2017
pros•en•ceph•a•lon  (pros′en sefə lon′, -lən),USA pronunciation n., pl.  -las, -la (-lə).USA pronunciation [Anat.]
  1. Anatomythe forebrain.
pros•en•ce•phal•ic  (pros′en sə falik),USA pronunciation adj. 
  • Greek prós(ō) forward (akin to pró pro-2) + enképhalon encephalon
  • Neo-Latin
  • 1840–50;

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

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