ger·on·tol·o·gy  (jěr'ən-tŏl'ə-jē)  n. The scientific study of the biological, psychological, and sociological phenomena associated with old age and aging. ge·ron'to·log'i·cal (jə-rŏn'tə-lŏj'ĭ-kəl), ge·ron'to·log'ic (-lŏj'ĭk) adj., ger'on·tol'o·gist n. |