a combining form meaning “old age,” used in the formation of compound words: gerontology.
Also, especially before a vowel, geront-.

< Greek, combining form representing geront-, stem of gérōn old man Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
geronto- or (before a vowel) geront-
combining form
indicating old age: gerontology; gerontophilia
[from Greek gerōn, geront- old man]
geront- or (before a vowel) geront-
combining form
[from Greek gerōn, geront- old man]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

geronto- or geront-
Old age: gerontology.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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