MACROCEPHALOUS
macrocephalic, macrocephalous
(adjective) having an exceptionally large head and brain
Source: WordNet® 3.1
Etymology
Adjective
macrocephalous (comparative more macrocephalous, superlative most macrocephalous)
Having a large head.
Having the cotyledons of a dicotyledonous embryo confluent, and forming a large mass compared with the rest of the body.
Source: Wiktionary
Mac`ro*ceph"a*lous, a. Etym: [Macro + Gr. kefalh` the head.]
1. Having a large head.
2. (Bot.)
Definition: Having the cotyledons of a dicotyledonous embryo confluent, and
forming a large mass compared with the rest of the body. Henslow.
Source: Webster’s Unabridged Dictionary 1913 Edition