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In some senses, brainbox is marked as slang. Watch for register when choosing this word.
brainbox
/ˈbɹeɪn(ˌ)bɒks/
noun 3
Definitions
noun
1
The cavity of the skull in which the brain is contained.
Holonyms: skull, cranium < head
The compromise was to use as much of the skull as possible by pushing the eyes in towards the centre, and relegating the brain box to the rear.
2
The skull; the head.
3
A very intelligent person.
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