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decay [decayed, decaying, decays]▼(to deteriorate)
verb
[UK: dɪˈk.eɪ] [US: dəˈk.eɪ]

decompose [decomposed, decomposing, decomposes]▼(to decay)
verb
[UK: ˌdiːk.əm.ˈpəʊz] [US: ˌdiːk.əmˈpoʊz]

decompose [decomposed, decomposing, decomposes]▼(to separate)
verb
[UK: ˌdiːk.əm.ˈpəʊz] [US: ˌdiːk.əmˈpoʊz]

rot [rotted, rotting, rots]▼((intransitive) to suffer decomposition)
verb
[UK: rɒt] [US: ˈrɑːt]

decay▼(process or result of being gradually decomposed)
noun
[UK: dɪˈk.eɪ] [US: dəˈk.eɪ]

decomposition [decompositions]▼(act of taking something apart)
noun
[UK: ˌdiːk.ɒm.pə.ˈzɪʃ.n̩] [US: ˌdik.əmpo.ˈzɪʃ.n̩]

decomposition [decompositions]▼(biological process)
noun
[UK: ˌdiːk.ɒm.pə.ˈzɪʃ.n̩] [US: ˌdik.əmpo.ˈzɪʃ.n̩]

decomposition [decompositions]▼(splitting into constituent parts)
noun
[UK: ˌdiːk.ɒm.pə.ˈzɪʃ.n̩] [US: ˌdik.əmpo.ˈzɪʃ.n̩]

dissolution [dissolutions]▼(dissolving, or going into solution)
noun
[UK: ˌdɪ.sə.ˈluːʃ.n̩] [US: ˌdɪ.sə.ˈluːʃ.n̩]