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Webster 1828 Edition

ppr.

Failing; declining; passing from a good, prosperous or sound state, to a worse condition; perishing.

Noun.

Decay; decline.

DECE'ASE, n. [L. to depart or to withdraw.] Literally, departure; hence, departure from this life; death; applied to human beings only.

decaying

decaying ‎(plural decayings)

The act of something that decays.
- 1839, William Jenkyn, James Sherman, An Exposition Upon the Epistle of Jude, page 274:
  Spiritual witherings and decayings are opposite to the word of God.