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[L. fusio, a pouring out, effusion]

1. Meeting and joining together through liquefaction by heat.
2. The process of fusing or uniting, as of the fragments of a fractured bone.
3. The union of adjacent tooth germs to form an oversize tooth of abnormal configuration or two teeth partially fused at the crown or root.
4. The blending of genetic material of two distinct cells or species.

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