Main Entry: se·nile

Pronunciation: \ˈsēn-ˌīl also ˈsen-\

Function: adjective

1 : of, relating to, exhibiting, or characteristic of old age <senile weakness> ; especially : 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 <senile red blood cells>