plural cavities
1
: an unfilled space within a mass
especially
: a hollowed-out space
2
: an area of decay in a tooth : caries
Examples of cavity in a Sentence
Some birds nest in tree cavities.
I had two cavities filled at the dentist's.
Recent Examples on the Web
Dark filaments of hydrogen gas thread the scene, blocking the light of stellar giants beyond, while the blue-white stars of the open cluster NGC 2244 can be seen carving out the vast cavity in the heart of the vast nebula flower.
—
Anthony Wood, Space.com, 14 Feb. 2026
Underground cavities found on Venus Taking a fresh look at radar data collected by Magellan, a team of scientists were able to spot a large underground cavity on Venus created by lava flow.
—Eric Lagatta, USA Today, 11 Feb. 2026
Recessed within the wall will be a rectangular cavity measuring three feet by seven feet—the outline of a grave.
—Rebecca Mead, New Yorker, 9 Feb. 2026
The training also makes clear that the definition of ectopic pregnancies — which are always life-threatening — includes any that implant in an abnormal location outside of the uterine cavity.
—Cassandra Jaramillo, CNN Money, 9 Feb. 2026
See All Example Sentences for cavity
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Anthony Wood, Space.com, 14 Feb. 2026
Underground cavities found on Venus Taking a fresh look at radar data collected by Magellan, a team of scientists were able to spot a large underground cavity on Venus created by lava flow.
—Eric Lagatta, USA Today, 11 Feb. 2026
Recessed within the wall will be a rectangular cavity measuring three feet by seven feet—the outline of a grave.
—Rebecca Mead, New Yorker, 9 Feb. 2026
The training also makes clear that the definition of ectopic pregnancies — which are always life-threatening — includes any that implant in an abnormal location outside of the uterine cavity.
—Cassandra Jaramillo, CNN Money, 9 Feb. 2026
See All Example Sentences for cavity
Cite this Entry
“Cavity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cavity. Accessed 18 Feb. 2026.
Copy CitationKids Definition
cavity
noun
cav·i·ty
ˈkav-ət-ē 
plural cavities
1
: a hollow place
especially
: an unfilled bodily space
lung cavity
2
: a hole hollowed out in a tooth by decay
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