Meg`a·ce·phal'ic (mĕg`ȧ*se*făl'ĭk), Meg`a*ceph'a*lous (-sĕf'ȧ*lŭs) }, adjective [ Mega- + Greek kefalh` head.] (Biol.) Large headed; -- applied to animals, and to plants when they have large flower heads. Found on http://www.encyclo.co.uk/webster/M/41