decomposition

noun
de·​com·​po·​si·​tion | \ (ˌ)dē-ˌkäm-pə-ˈzish-ən How to pronounce decomposition (audio) \

Medical Definition of decomposition

: the act or process of decomposing : the state of being decomposed:
a : the separation or resolution (as of a substance) into constituent parts or elements or into simpler compounds decomposition of mercuric oxide into mercury and oxygen
b : organic decay the decomposition of a dead body

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to spread over or through

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