from 5351; decayed, i.e. (by implication) perishable:

KJV-- corruptible.

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5351 phtheiro (fthi'-ro);

probably strengthened from phthio (to pine or waste); properly, to shrivel or wither, i.e. to spoil (by any process) or (generally) to ruin (especially figuratively, by moral influences, to deprave):

KJV-- corrupt (self), defile, destroy.