Definition of gerontologist noun from the Oxford Advanced Learner's Dictionary

 

gerontologist

 noun
noun
BrE BrE//ˌdʒerɒnˈtɒlədʒɪst//
 
; NAmE NAmE//ˌdʒerənˈtɑːlədʒɪst//
 
(especially North American English)
 
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a person who studies the process of people growing old
See the Oxford Advanced American Dictionary entry: gerontologist