decay is a topic covered in the Taber's Medical Dictionary.

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(dē-kā′ )

[″ + cadere, to fall, die]

1. Gradual loss of vigor with physical and mental deterioration as may occur in aging.
2. To waste away.
3. Decomposition of organic matter by the action of microorganisms.
SEE: caries
4. Disintegration of radioactive substances.

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