noun
a medical condition in which the circumference of the head is larger than average
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Macrocephaly is a medical condition characterized by an abnormally large head size.
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I heard that baby has macrocephaly, that's why his head looks bigger than usual.
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Dude, have you seen his macrocephaly? It's like a watermelon!
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His macrocephaly in the business world refers to his ability to think big and come up with innovative ideas.