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1. Growing old; aging.
2. No longer dividing. Used of a cell.

[Latin senēscēns, senēscent-, present participle of senēscere, to grow old, inchoative of senēre, to be old, from senex, sen-, old; see sen- in Indo-European roots.]

se·nes′cence n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. growing old
2. characteristic of old age
[C17: from Latin senēscere to grow old, from senex old]
seˈnescence n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(sɪˈnɛs ənt)

growing old; aging.
[1650–60; < Latin senēscent-, s. of senēscēns, present participle of senēscere to grow old, derivative of senex, s. sen- old; see -escent]
se•nes′cence, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.senescent - growing oldsenescent - growing old        
old - (used especially of persons) having lived for a relatively long time or attained a specific age; "his mother is very old"; "a ripe old age"; "how old are you?"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


adj (form)alternd
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in classic literature ?
And now, as the night was senescent, And star-dials pointed to morn -- As the star-dials hinted of morn -- At the end of our path a liquescent And nebulous lustre was born, Out of which a miraculous crescent Arose with a duplicate horn -- Astarte's bediamonded crescent, Distinct with its duplicate horn.
After seven days under room conditions (20 [+ or -] 5 [degrees]C and RH 63 [+ or -] 2%), fruits were evaluated for the following attributes: respiratory rates nmol of CO2 k[g.sup.-1] s-1) and ethylene production (pmol C2H4 k[g.sup.-1] s-1), skin color (less red region), pulp firmness (N), soluble solids (SS), titratable acidity (TA), SS / TA ratio, farinaceous pulp and senescent degeneration incidence, according to methodology described in Steffens et al.
"Senescent cells are effectively the opposite of stem cells, which have an unlimited potential for self-renewal or division," Delfarah said.
The team made a path breaking discovery that senescent cells did not produce a group of chemicals called nucleotides, which are essential for forming DNA.
UBX0101 is a p53/MDM2 interaction inhibitor that targets selective elimination of senescent cells.
"Thanks to our 'one-two punch' approach, we have managed to destroy senescent EOC cells in preclinical ovarian cancer models.
To date, a deep understanding of mechanisms regulating senescence induction is lacking since we do not have a clear definition of "senescent cell".
senescent cells--also known as zombie cells--form in the heart during aging and lead to heart failure."
Citation: Harshini Neelakantan et al., Small molecule nicotinamide N-methyltransferase inhibitor activates senescent muscle stem cells and improves regenerative capacity of aged skeletal muscle.
Zombie cells, aka senescent cells, are those that are too damaged to carry out normal functions, but aren't completely dead, which prevents the body from clearing them.
Senescent cells have typically sustained some sort of damage.