A prefix meaning 'old age' or 'elderly,' used in building longer scientific and medical terms related to aging.
From Greek 'geron' (old man). This combining form appears at the beginning of dozens of scientific terms (gerontology, gerontocracy, gerodermia) to indicate age-related subjects.
The prefix 'geronto-' built an entire vocabulary around aging just in the last 200 years, showing how a single Greek root can spawn a whole field of knowledge when a society suddenly cares about studying old people.
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