decrepitude

n [U] state of being decrepit 衰老; 老朽; 破旧.

decompress, decompression, decongestant, decontaminate, decontamination, decontrol, decor, decorate, decoration, decorative, decorator, decorous, decorously, decorum, decoy, decrease, decree, decree absolute, decree nisi, decrepit, decry, dedicate, dedicate to, dedicated, dedication, deduce, deducible, deduct, deductible, deduction, deductive, deductively, deed, deed of covenant, deed poll, deed-box, deem, deep, deep down, deep space,