: 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
Jared Ranahan, Forbes.com, 7 Sep. 2025
Anthony Figueiredo, a British priest with the Diocese of Assisi, handles a sliver of the boy's pericardium — the sac that surrounds the heart — that is touring the world as a religious relic.
—Ruth Sherlock, NPR, 7 Sep. 2025
Speaking to The Times, Michelle Froome said her husband had also sustained a pericardial rupture, a tear in the protective sac surrounding the heart, often caused by blunt chest trauma and often occurring in road accidents.
—Ben Morse, CNN Money, 3 Sep. 2025
Over 3 gallons of the liquid, which is stored in a special intestinal sac, can be released at a time, according to NOAA.
—Brendan Rascius, Miami Herald, 2 Sep. 2025
See All Example Sentences for sac
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Noun
Found nowhere else on the planet, this tiny amphibian is known for its unique method of parenting, with male Darwin’s frogs gestating their young in the vocal sac below their mouth.
—Jared Ranahan, Forbes.com, 7 Sep. 2025
Anthony Figueiredo, a British priest with the Diocese of Assisi, handles a sliver of the boy's pericardium — the sac that surrounds the heart — that is touring the world as a religious relic.
—Ruth Sherlock, NPR, 7 Sep. 2025
Speaking to The Times, Michelle Froome said her husband had also sustained a pericardial rupture, a tear in the protective sac surrounding the heart, often caused by blunt chest trauma and often occurring in road accidents.
—Ben Morse, CNN Money, 3 Sep. 2025
Over 3 gallons of the liquid, which is stored in a special intestinal sac, can be released at a time, according to NOAA.
—Brendan Rascius, Miami Herald, 2 Sep. 2025
See All Example Sentences for sac
Cite this Entry
“Sac.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sac. Accessed 16 Sep. 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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