Look up decay in Wiktionary, the free dictionary.

Decay may refer to:

• Decay (DC Comics), a comic book character
• Bacterial decay, decomposition of organic matter
• Radioactive decay
• Urban decay
• Particle decay, in physics
• Orbital decay, the process of prolonged reduction in the height of a satellite's orbit
• Half-Life: Decay, a computer game add-on
• Dental caries, also known as tooth decay
• Exponential decay, the decrease of a value in proportion to its value
• In music, how quickly the sound drops to the sustain level after the initial peak, see ADSR envelope

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