Here you will find one or more explanations in English for the word Macrencephalic.
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Macrencephalic
Macrencephalic Mac`ren*ce*phal"ic, Macrencephalous
Mac`ren*ceph"a*lous, a. [Macro + encephalic, encephalous.]
Having a large brain.
Meaning of Macrencephalic from wikipedia