[{"Bold_text": "verb (used without object)", "List Items": ["to become decomposed; rot :vegetation that was decaying.Synonyms: putrefy , wither , degenerate", "to decline in excellence, prosperity, health, etc.; deteriorate .", "Physics.(of a radioactive nucleus) to change spontaneously into one or more different nuclei in a process in which atomic particles, as alpha particles, are emitted from the nucleus, electrons are captured or lost, or fission takes place."]}, {"Bold_text": "verb (used with object)", "List Items": ["to cause to decay or decompose; rot :The dampness of the climate decayed the books."]}, {"Bold_text": "noun", "List Items": ["decomposition ; rot :Decay made the wood unsuitable for use.Synonyms: putrefaction", "a gradual falling into an inferior condition; progressive decline:the decay of international relations; the decay of the Aztec civilizations.", "decline in or loss of strength, health, intellect, etc.:His mental decay is distressing.Synonyms: dilapidation , degeneration , impairment , decadence , deterioration", "Physics. radioactive decay radioactive decay.", "Aerospace.the progressive, accelerating reduction in orbital parameters, particularly apogee and perigee, of a spacecraft due to atmospheric drag."]}, {"Bold_text": "Noun", "List Items": null}, {"Bold_text": "Verb", "List Items": null}]