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v. i. [ imp. & p. p. Exfoliated p. pr. & vb. n. Exfoliating ] [ L. exfoliare to strip of leaves; ex out, from + folium leaf. ] 1. To separate and come off in scales or laminæ, as pieces of carious bone or of bark. [ 1913 Webster ]

2. (Min.) To split into scales, especially to become converted into scales at the result of heat or decomposition. [ 1913 Webster ]