1
: a closed sac having a distinct membrane and developing abnormally in a cavity or structure of the body
2
: a body resembling a cyst: such as
a
: a resting spore of many algae
b
: the air bladder of certain algae or aquatic plants (such as rockweed)
c
: a capsule formed about a minute organism going into a resting or spore stage
also
: this capsule with its contents
d
: a resistant cover about a parasite produced by the parasite or the host
: bladder : sac
blastocyst
Examples of cyst in a Sentence
Recent Examples on the Web
Frieda Klotz, Smithsonian Magazine, 25 Apr. 2025
This isn't the first time Bieber has dealt with the pain of an ovarian cyst.
—Edward Segarra, USA Today, 23 Apr. 2025
Doctors removed the cyst, but warned that the procedure and its side effects could lead to her baby being born with health problems.
—Johanna Alarcón, New York Times, 12 Apr. 2025
While surgery can help, ovarian cyst removal may decrease egg reserves.
—Josh Hammer, Newsweek, 15 Feb. 2025
See All Example Sentences for cyst
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Noun
But one patient who underwent surgery to remove a cyst ended up in a vegetative state.
—Frieda Klotz, Smithsonian Magazine, 25 Apr. 2025
This isn't the first time Bieber has dealt with the pain of an ovarian cyst.
—Edward Segarra, USA Today, 23 Apr. 2025
Doctors removed the cyst, but warned that the procedure and its side effects could lead to her baby being born with health problems.
—Johanna Alarcón, New York Times, 12 Apr. 2025
While surgery can help, ovarian cyst removal may decrease egg reserves.
—Josh Hammer, Newsweek, 15 Feb. 2025
See All Example Sentences for cyst
Cite this Entry
“Cyst.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cyst. Accessed 1 May. 2025.
Copy CitationKids Definition
cyst
noun1
: a closed pouch or sac of fluid or solid material that develops in the body in some diseased conditions
2
: a covering resembling a cyst or a body (as a spore) with such a covering
cystic
adjective
ˈsis-tik
Medical Definition
cyst
noun1
: a closed sac having a distinct membrane and developing abnormally in a body cavity or structure
2
: a body resembling a cyst: as
a
: a capsule formed about a minute organism going into a resting or spore stage
also
: this capsule with its contents
b
: a resistant cover about a parasite produced by the parasite or the host compare hydatid sense 2a
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