[geront-] or geronto- comb form [F geront-, geronto-, fr. Gk geront-, geronto-, fr. geront-, geron old man; akin to Gk geras old age, Skt jarati he grows old]: aged one: old age "gerontology"
GERONT-
Meaning of GERONT- in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012