Usually means: Breakdown or transformation of matter.
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We found 13 dictionaries that define the word decays:

General (9 matching dictionaries)
  1. decays: Merriam-Webster
  2. decays: Collins English Dictionary
  3. decays: Vocabulary.com
  4. Decay's, decays: Wordnik
  5. decays: Cambridge Advanced Learner's Dictionary
  6. decays: Wiktionary
  7. decays: Dictionary.com
  8. decays: Cambridge Essential American English Dictionary
  9. decays: TheFreeDictionary.com

Business (1 matching dictionary)
  1. decays: Legal dictionary

Computing (1 matching dictionary)
  1. decays: Encyclopedia

Medicine (2 matching dictionaries)
  1. decays: Merriam-Webster Medical Dictionary
  2. decays: Medical dictionary

(Note: See decay as well.)

Definitions from Wiktionary (decay)

noun:  (ecology, medicine) The process or result of being gradually decomposed; rot, decomposition.
noun:  a gradual decrease of a stored charge, magnetic flux, current, etc.
noun:  progressive change in the path of an earth-orbiting satellite due to atmospheric drag.
noun:  (obsolete) Overthrow, downfall, destruction, ruin.
noun:  (programming) The situation, in programming languages such as C, where an array loses its type and dimensions and is reduced to a pointer, for example by passing it to a function.
verb:  (intransitive) To deteriorate, to get worse, to lose strength or health, to decline in quality.
verb:  (intransitive, electronics, of storage media or the data on them) To undergo bit rot, that is, gradual degradation.
verb:  (intransitive, computing, of software) To undergo software rot, that is, to fail to be updated in a changing environment, so as to eventually become legacy or obsolete.
verb:  (intransitive, physics, of a satellite's orbit) To undergo prolonged reduction in altitude (above the orbited body).
verb:  (intransitive, of organic material) To rot, to go bad.
verb:  (intransitive, transitive, physics, chemistry, of an unstable atom) To change by undergoing fission, by emitting radiation, or by capturing or losing one or more electrons; to undergo radioactive decay.
verb:  (intransitive, transitive, physics, of a quantum system) To undergo optical decay, that is, to relax to a less excited state, usually by emitting a photon or phonon.
verb:  (intransitive, aviation) Loss of airspeed due to drag.
verb:  (transitive) To cause to rot or deteriorate.
verb:  (programming, intransitive) Of an array: to lose its type and dimensions and be reduced to a pointer, for example when passed to a function.
noun:  A deterioration of condition; loss of status, quality, strength, or fortune. [(nuclear physics) Any of several processes by which unstable nuclei emit subatomic particles and/or ionizing radiation and disintegrate into one or more other nuclei.]
noun:  (physics) Short for radioactive decay. [(nuclear physics) Any of several processes by which unstable nuclei emit subatomic particles and/or ionizing radiation and disintegrate into one or more other nuclei.]
▸ Also see decay


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