Having undergone decay, rotted. / (dated) Reduced in circumstances; having lost one's status or fortune.

simple past tense and past participle of decay

The process or result of being gradually decomposed. / A deterioration of condition; loss of status or fortune. / (obsolete) Overthrow, downfall, ruin.

(intransitive, electronics, of storage media or the data on them) To undergo bit rot, that is, gradual degradation.

present participle of decay

The process of undergoing decay.

Third-person singular simple present indicative form of decay

plural of decaying

(creationism, pseudoscience) The discredited theory that the speed of light has decreased over time, proposed by creationists in order to support the belief that the universe is a few thousand years old even though there are objects visible today that are billions of light years away (whereas a constant speed of light would indicate that the universe is billions of years old and so contradict this belief).

(physics) A nuclear reaction in which a beta particle (electron or positron) is emitted.