presenile Syllabification: (pre·se·nile)Pronunciation: /prēˈsēˌnīl, -ˈsenˌīl/Definition of presenile adjective occurring in or characteristic of the period of life preceding old age:the factors that may predispose women to presenile Alzheimer’s disease are not knownpresenile in other Oxford dictionaries Definition of presenile in the British & World English dictionary