senescent
Americanadjective
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growing old; aging.
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Cell Biology. (of a cell) no longer capable of dividing but still alive and metabolically active.
adjective
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growing old
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characteristic of old age
Other Word Forms
Etymology
Origin of senescent
First recorded in 1650–60; from Latin senēscent- (stem of senēscēns ) present participle of senēscere “to grow old,” equivalent to sen- “old” + -ēscent- -escent
Explanation
Something senescent is growing old or is elderly. Senescent things are deteriorating. Senescent and senile have something in common — the Latin root senex which means "old.” A baby or even a teenager would not be described as senescent because they're youthful and full of life. A nursing home is full of people who could be described as senescent; they’re old. "The Who" was going to sing “hope I die before I get senescent,” but it just didn’t have the same ring to it.
Vocabulary lists containing senescent
This Week In Words: August 31–September 6, 2019
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Ancient Wisdom: Synonyms for "Old"
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The Last Cuentista
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Some senescent cells may limit fibrosis and assist tissue repair, while others appear to fuel chronic inflammation, metabolic disorders, tissue degeneration, and even cancer progression.
From Science Daily ● May 22, 2026
Scientists believe emerging technologies such as single-cell omics, lineage tracing, and spatial profiling may help reveal the distinct subtypes of senescent cells and identify safer therapeutic targets.
From Science Daily ● May 22, 2026
Some researchers are now investigating CAR-T cell immunotherapies that can recognize markers found on senescent cells and selectively remove them.
From Science Daily ● May 22, 2026
In some cases, senescent cells may actually help protect and repair the body.
From Science Daily ● May 22, 2026
In one thin arm, threaded with veins in a kind of senescent bas-relief, was a basket.
From "The Great Santini" by Pat Conroy
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
