Disintegration or rot of wood or other substance through the action of mold.
Merriam-Webster Online Dictionary
decay (verb)intransitive verb
1.
to decline from a sound or prosperous condition
2.
to decrease usually gradually in size, quantity, activity, or force
3.
to fall into ruin
4.
to decline in health, strength, or vigor
5.
transitive verb
to undergo decomposition - decaying fruit
1.
obsolete to cause to decay - impair infirmity that decays the wise Shakespeare
2.
to destroy by decomposition
1.
gradual decline in strength, soundness, or prosperity or in degree of excellence or perfection
2.
a wasting or wearing away - ruin
3.
obsolete - destruction death
4.
a) - rot , specifically aerobic decomposition of proteins chiefly by bacteria
b) the product of decay
5.
a decline in health or vigor
6.
decrease in quantity, activity, or force as
a) spontaneous decrease in the number of radioactive atoms in radioactive material
b) spontaneous disintegration (as of an atom or a particle)
decay (Wikipedia)
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Decay may refer to: