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senescent

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

1650–60; < Latin senēscent- (stem of senēscēns) present participle of senēscere ‘to grow old’, equivalent to sen- ‘old’ + -ēscent- -escent
Related formsse·nes·cence, nounun·se·nes·cent, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for senescence

senescent

adjective
  1. growing old
  2. characteristic of old age
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Derived Formssenescence, noun

Word Origin

C17: from Latin senēscere to grow old, from senex old
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for senescence

n.

1690s, from senescent + -ence. Related: Scenescency (1660s).

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senescent

adj.

1650s, from Latin senescentem (nominative scenescens), present participle of senescere "to grow old," from senex "old" (see senile).

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Online Etymology Dictionary, © 2010 Douglas Harper

senescence in Medicine

senescence

(sĭ-nĕsəns)
n.
  1. The process of growing old; aging.
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senescent

(sĭ-nĕsənt)
adj.
  1. Growing old; aging.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.