|makrō|sefələs adjective
or mac·ro·ce·phal·ic -_sə̇ˈfalik
Etymology: French macrocéphale (from Greek makrokephalos having a long head, from makro- macr- + -kephalos -cephalous) + English -ous or -ic
1.
a. : having an exceptionally large head
a macrocephalous idiot
b. of a cranium : exceptionally or abnormally large
2. of a dicotyledonous embryo : having the cotyledons consolidated