: a pouch within an animal or plant often containing a fluid
a synovial sac
sacrifice
Sac
3 of 4variant of sauk
1
special agent in charge
2
Strategic Air Command
Examples of sac in a Sentence
Recent Examples on the Web
Grrlscientist, Forbes, 26 Nov. 2024
Bursitis refers to swelling and inflammation in these sacs.
—Laura Dorwart, Verywell Health, 13 Aug. 2024
Female Joro spiders, known for their yellow and gray abdomens, will lay egg sacs holding 400 to 500 eggs.
—Aliza Chasan, CBS News, 18 Sep. 2024
McVay said a few days later that a bursa sac in Nacua’s knee had burst.
—Gary Klein, Los Angeles Times, 9 Sep. 2024
See all Example Sentences for sac 
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Noun
When the muscles are relaxed, the pigment sacs shrink to nearly invisible specks and the octopus appears to be white, but when the muscles contract, the sacs expand, spreading pigment granules across a small area of the skin and revealing the color.
—Grrlscientist, Forbes, 26 Nov. 2024
Bursitis refers to swelling and inflammation in these sacs.
—Laura Dorwart, Verywell Health, 13 Aug. 2024
Female Joro spiders, known for their yellow and gray abdomens, will lay egg sacs holding 400 to 500 eggs.
—Aliza Chasan, CBS News, 18 Sep. 2024
McVay said a few days later that a bursa sac in Nacua’s knee had burst.
—Gary Klein, Los Angeles Times, 9 Sep. 2024
See all Example Sentences for sac
Dictionary Entries Near sac
Cite this Entry
“Sac.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sac. Accessed 2 Dec. 2024.
Copy CitationMedical Definition
sac
noun
: a soft-walled anatomical cavity usually having a narrow opening or none at all and often containing a special fluid
a synovial sac
see air sac, amniotic sac, dental sac, lacrimal sac
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