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Answer for the clue "The peeling off in flakes or scales of bark or dead skin ", 11 letters:
exfoliation

Word definitions for exfoliation in dictionaries

Wikipedia Word definitions in Wikipedia
Exfoliation (from the term "foliate", meaning “related to leaves ”) means the removal or loss of leaves from a plant . It is used both to describe the loss of a leaves as a natural part of a plant’s life cycle (such as in the case of deciduous trees which ...

WordNet Word definitions in WordNet
n. the peeling off in flakes or scales of bark or dead skin; "exfoliation is increased by sunburn" a thin flake of dead epidermis shed from the surface of the skin [syn: scale , scurf ]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
early 15c., noun of action from Latin exfoliare (see exfoliate ).

Wiktionary Word definitions in Wiktionary
n. 1 The scaling off of a bone, a rock, or a mineral, etc.; the state of being exfoliated. 2 The loss of leaves from a plant. 3 The removal of a layer of skin, as in cosmetic preparation.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Exfoliation \Ex*fo`li*a"tion\, n. [Cf. F. exfoliation.] The scaling off of a bone, a rock, or a mineral, etc.; the state of being exfoliated.

Usage examples of exfoliation.

An exfoliation of the rock itself you would call the houses that seem to grow there -- so identical is the colour and character.

Now the cycle is completed, and the parasite sheds exfoliations that will in turn infect new hosts.

The exfoliations are metabolically active when released, unlike bacterial spores.

Arn called the meeting to order and gave a brief presentation about his research into survival of the exfoliations before throwing the matter open to the meeting.