Characteristic of or relating to the study and understanding of aging and old age.
An alternative adjectival form derived from 'geratology,' using the suffix '-ous' to create an adjective meaning 'characterized by or relating to.' This is a rare variant in modern usage.
English loves giving us multiple ways to say the same thing, which is why 'geratologic' and 'geratologous' both exist—but 'geratologic' won the popularity contest.
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