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From Biology-Online Dictionary
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1. (Science: botany) peeling off in thin layers, shreds, or plates, as the bark of some trees.

2. (Science: dermatology) to shed cells from the skin or from mucous membranes.

3. (Science: dentistry) to fall out, with development, the deciduous teeth exfoliate and permanent teeth erupt into the space.

Origin: L. Exfoliatio