dry rot

noun
1.
Plant Pathology.
a.
a decay of seasoned timber, resulting in its becoming brittle and crumbling to a dry powder, caused by various fungi.
b.
any of various diseases of plants in which the rotted tissues are dry.
2.
any concealed or unsuspected inner decay.

Origin:
1785–95

Dictionary.com Unabridged

dry-rot

[drahy-rot]
verb (used without object), verb (used with object), dry-rotted, dry-rotting.
to undergo or cause to undergo the action or effects of dry rot.

Origin:
1865–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
dry rot
 
n
1.  crumbling and drying of timber, bulbs, potatoes, or fruit, caused by saprotrophic basidiomycetous fungi
2.  any fungus causing this decay, esp of the genus Merulius
3.  moral degeneration or corrupt practices, esp when previously unsuspected

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