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rarefaction [rarefactions]▼(reduction in the density of a material)noun[UK: ˌreə.rɪ.ˈfæk.ʃn̩] [US: ˌreə.rɪ.ˈfæk.ʃn̩]
leukoaraiosis▼(rarefaction of the white matter in the brain)noun
osteoporosis [osteoporoses]▼(bone disease)noun[UK: ˌɒ.stiəʊ.pə.ˈrəʊ.sɪs] [US: ˌɒ.stio.ʊ.pəˈro.ʊ.sɪs]
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