[ si-nes-uh nt ]
/ sɪˈnɛs ənt /


growing old; aging.
Cell Biology. (of a cell) no longer capable of dividing but still alive and metabolically active.

Origin of senescent

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

Related forms

se·nes·cence, nounun·se·nes·cent, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for senescent

British Dictionary definitions for senescent


/ (sɪˈnɛsənt) /


growing old
characteristic of old age

Derived Forms

senescence, noun

Word Origin for senescent

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

Medicine definitions for senescent


[ sĭ-nĕsənt ]


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