1411320 jmdict A [id=2173381] 退化[news2,nf41] たいか[news2,nf41] [1][n,vs,vi][fld=biol] degeneration; retrogression; atrophy [2][n,vs,vi] regression (e.g. of society); deterioration; degeneration [ant=1366000・進化[2]]