senescent

[si-nes-uhnt]
adjective
1.
growing old; aging.
2.
Cell Biology. (of a cell) no longer capable of dividing but still alive and metabolically active.

Origin:
1650–60; < Latin senēscent- (stem of senēscēns) present participle of senēscere ‘to grow old’, equivalent to sen- ‘old’ + -ēscent- -escent

senescence, noun
unsenescent, adjective
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World English Dictionary
senescent (sɪˈnɛsənt)
 
adj
1.  growing old
2.  characteristic of old age
 
[C17: from Latin senēscere to grow old, from senex old]
 
se'nescence
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

senescent
1656, from L. scenescens, prp. of senescere "to grow old," from senex "old" (see senile).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

senescent se·nes·cent (sĭ-něs'ənt)
adj.
Growing old; aging.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
They plan to activate a gene in the mouse that will selectively eliminate senescent cells.
Baker has developed a way of killing all of a mouse's senescent cells by feeding them with a specific drug.
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