: 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
Bethany Brookshire, Scientific American, 25 Jan. 2025
Surgical excision during infection is more challenging because inflammation makes the sac harder to remove in its entirety.
—Josh Hammer, Newsweek, 23 Dec. 2024
The sclerosing agent causes the sac to harden and shrink, preventing the reaccumulation of fluid in the space.16
Varicoceles can often be managed with lifestyle changes, like wearing an athletic supporter (jockstrap) and losing weight.
—Josephine Hessert, Verywell Health, 1 Dec. 2024
The company also advises inspecting your Christmas tree before bringing in it inside your home, checking the branches, trunk and underside of the tree for any signs of bugs or egg sacs.
—Josh Hammer, Newsweek, 23 Dec. 2024
See all Example Sentences for sac 
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Noun
The joints—and the sacs between each one—allow the skeleton to shift and withstand pressure, even if that particular joint isn’t helping anyone do a backbend.
—Bethany Brookshire, Scientific American, 25 Jan. 2025
Surgical excision during infection is more challenging because inflammation makes the sac harder to remove in its entirety.
—Josh Hammer, Newsweek, 23 Dec. 2024
The sclerosing agent causes the sac to harden and shrink, preventing the reaccumulation of fluid in the space.16
Varicoceles can often be managed with lifestyle changes, like wearing an athletic supporter (jockstrap) and losing weight.
—Josephine Hessert, Verywell Health, 1 Dec. 2024
The company also advises inspecting your Christmas tree before bringing in it inside your home, checking the branches, trunk and underside of the tree for any signs of bugs or egg sacs.
—Josh Hammer, Newsweek, 23 Dec. 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 6 Feb. 2025.
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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