The process or result of being gradually decomposed; rot, decomposition.
I fancied at first the stuff was paraffin wax, and smashed the jar accordingly. But the odor of camphor was unmistakable. It struck me as singularly odd, that among the universal decay, this volatile substance had chanced to survive, perhaps through many thousand years.
A deterioration of condition; loss of status, quality, strength, or fortune.
civic and moral decay
Overthrow, downfall, destruction, ruin.
Let’s cheere our ſouldiers to incounter him, That grieuous image of ingratitude: That fiery thirſter after Soueraigntie: […] Reſolue my Lords and louing ſouldiers now, To ſaue your king and country from decay:
From Middle English decayen, dekeyen (“to decrease, diminish”), from Anglo-Norman decaeir (“to fall away, decay, decline”), from Vulgar Latin *dēcadere, etymologically restored form of Latin dēcidere ...
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To rot, to go bad.
The cat's body decayed rapidly.
To change by undergoing fission, by emitting radiation, or by capturing or losing one or more electrons; to undergo radioactive decay.
Uranium decays to radium through a long series of steps with a cumulative half-life of 4.4 billion years.