adj 1 : of, relating to, exhibiting, or characteristic of old age < weakness> : esp : exhibiting a loss of mental faculties associated with old age 2 : being a cell that cannot undergo mitosis and is in the stage of declining functional capacities prior to the time of death <a red blood cell> .
weakness> : esp : exhibiting a loss of mental faculties associated with old age 2 : being a cell that cannot undergo mitosis and is in the stage of declining functional capacities prior to the time of death <a 
