Late 19th century; earliest use found in The New Sydenham Society's Lexicon of Medicine and the Allied Sciences. From macro- + -cephalia, probably after French macrocéphaliemacrocephaly.
Definition of macrocephalia in US English:
macrocephalia
noun
rare
Macrocephaly. Also figurative.
Origin
Late 19th century; earliest use found in The New Sydenham Society's Lexicon of Medicine and the Allied Sciences. From macro- + -cephalia, probably after French macrocéphalie macrocephaly.