se·nile 
(sēnīl′, sĕnīl′)
(sēnīl′, sĕnīl′)adj.
1.
a. Relating to or having diminished cognitive function, as when memory is impaired, because of old age.
b. Being a disease or condition whose cause is primarily advanced age: senile cataracts.
2. Geology At the end of an erosion cycle: senile soil.
[Latin senīlis, proper to or characteristic of old people, aged, from senex, sen-, old; see sen- in the Appendix of Indo-European roots.]
senile′ly adv.
se·nili·ty (sĭ-nĭlĭ-tē) n.
- Indo-European root: gembh-
- Indo-European root: gemə-
- Indo-European root: genu-
- Indo-European root: genu-
- Indo-European root: genə-
- Indo-European root: ger-
- Indo-European root: gerbh-
- Indo-European root: gerə-
- Indo-European root: gerə-
- Indo-European root: geus-
- Indo-European root: ghabh-
- Indo-European root: ghans-
- Indo-European root: ghebh-el-
- Indo-European root: ghedh-
- Indo-European root: ghei-
- Indo-European root: ghel-
- Indo-European root: ghel-
- Indo-European root: ghend-
- Indo-European root: gher-
- Indo-European root: gher-
- Indo-European root: gherə-
- Indo-European root: ghes-
- Indo-European root: gheslo-
- Indo-European root: gheu-
- Indo-European root: gheu(ə)-