Decay.
Synonyms:
corrupt, decompose, molder, putrefy, rot, spoil.
Rot is a strong word, ordinarily esteemed coarse, but on occasion capable of approved emphatic use; as, "the name of the wicked shall rot," Prov. x, 7; decay and decompose are now common euphemisms. A substance is decomposed when resolved into its original elements by any process; it is decayed when resolved into its original elements by natural processes; it decays gradually, but may be instantly decomposed, as water into oxygen and hydrogen; to say that a thing is decayed may denote only a partial result, but to say it is decomposed ordinarily implies that the change is complete or nearly so. Putrefy and the adjectives putrid and putrescent, and the nouns putridity and putrescence, are used almost exclusively of animal matter in a state of decomposition, the more general word decay being used of either animal or vegetable substances.