A bird with a beak where the upper and lower mandibles cross over each other, or a person with a condition where teeth are misaligned.
Compound from 'cross' + 'beak,' referring to the crossed-over appearance. Used in both ornithology and medical contexts.
Crossbeak birds (like crossbills) have this bizarre twisted beak that's actually perfect for extracting seeds from pine cones—their 'deformity' is actually a specialized adaptation!
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