bark

The outermost layer of a woody stem or root, adapted to protect the underlying tissues. The term may refer to the non-living (outer) bark or to all the tissues that separate at the vascular cambium.

bark beetle,
bark cambium,
bark chippings,
bark congestion,
bark crack,
bark exudate,
bark gauge,
bark inclusion,
bark ridge,
bark ringing,
bark-bound,
bast,
bleeding (from bark),
cork,
de-bark

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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