Origin of Decay
From Old French decair (“to fall away, decay, decline”), from Medieval Latin *decadere, restored form of Latin decidere (“to fall away, fail, sink, perish”), from de (“down”) + cadere (“to fall”); compare decadent and decadence.
Middle English decayen from Old French decair from Vulgar Latin dēcadere Latin dē- de- Latin cadere to fall kad- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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