geriatric

From geriatrics. By surface analysis, Ancient Greek γῆρας (gêras, “old age”) +‎ -iatric.

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geriatric (comparative more geriatric, superlative most geriatric)

1. Relating to the elderly.
2. Elderly, old.

   Synonyms: hoary, long in the tooth, on in years; see also Thesaurus:elderly

3. Relating to geriatrics.
   • 2020, Georgi Gospodinov, chapter 2, in Time Shelter, page 12:

     At that moment he was practicing one of his professions—that of geriatric psychiatrist.

geriatric (plural geriatrics)

1. (slang) An old person.

   Synonyms: genarian, oldster, silver top; see also Thesaurus:old person