Gummosis

Gummosis is a technical term used in forestry for:

(a) In wood anatomy, partial or complete destruction of cells, the resulting mass being transformed into gum which occludes the newly-formed cavity and occasionally the cells adjacent to it.
(b) In forest pathology, a disease process in hardwood trees, characterized by gum exudation.

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Gun Jumping, Gun-Cotton, Gun-Metal, Gunnings, Gunpowder plot, Gunther