Having a brain or brains of a particular type (usually used in compounds like 'quick-brained' or 'bird-brained').
Past participle of 'brain' used as an adjective, from Old English 'brægen'. As an adjective, it describes something as having or possessing brain qualities.
When we say someone is 'bird-brained,' we're not being random—birds actually have impressive brain-to-body ratios and solve complex problems. The insult works only because we've forgotten how smart birds really are!
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