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
Md Published, Verywell Health, 3 June 2025
Afterward, the plastic surgeon told Miranda and Bryan that Cameron, now 4, had done great and described the mass as fatty tissue, not a typical cyst or tumor.
—Jordan Greene, People.com, 2 June 2025
In addition to eggs, tissue cysts present in the meat of warm-blooded animals can spread toxoplasmosis as well if they are not destroyed by cooking to proper temperature.
—Bill Sullivan, The Conversation, 28 May 2025
While surgical removal of cysts and arthritic tissue may relieve pain, the resulting nail changes may be permanent, with a risk of recurrence.
—Lydia Patrick, MSNBC Newsweek, 22 May 2025
See All Example Sentences for cyst
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Noun
Renal ultrasound: This noninvasive imaging test can detect kidney injury, changes in blood vessels or filtering units, and abnormal cysts or growths.
—Md Published, Verywell Health, 3 June 2025
Afterward, the plastic surgeon told Miranda and Bryan that Cameron, now 4, had done great and described the mass as fatty tissue, not a typical cyst or tumor.
—Jordan Greene, People.com, 2 June 2025
In addition to eggs, tissue cysts present in the meat of warm-blooded animals can spread toxoplasmosis as well if they are not destroyed by cooking to proper temperature.
—Bill Sullivan, The Conversation, 28 May 2025
While surgical removal of cysts and arthritic tissue may relieve pain, the resulting nail changes may be permanent, with a risk of recurrence.
—Lydia Patrick, MSNBC Newsweek, 22 May 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 6 Jun. 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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