Which word can be defined as "deterioration of cells, tissues, or organs"?

Question

Quizplus · Accepted Answer

Degeneration is deterioration in structure or function of cells, tissues, or organs, as in disease or aging.
The degeneration of his vision came with old age.
Evolution is the process of growth and development or the theory that organisms have grown and developed from past organisms.
It has been fun to watch her evolution from nursing student to head nurse over the last couple of decades. 
Deviation is the act of departing from the accepted practice or the norm.
The deviation from our original plan of following the GPS led us down a strange road. 
Declination is a bending or sloping downward. It can also mean deterioration.
There has been a declination in the team's morale after having lost 10 games in a row.

Which Word Can Be Defined as "Deterioration of Cells, Tissues