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
Since February 2021, NASA's Perseverance rover has been exploring a region on Mars known as Jezero Crater, a huge cavity believed to have once hosted a lake.
—
Monisha Ravisetti, Space.com, 10 Sep. 2025
Schumann Resonance Time Acceleration Schumann resonances are natural, low-frequency electromagnetic hums that form in the cavity between Earth’s surface and the ionosphere (50-600 miles above the surface).
—Kaif Shaikh, Interesting Engineering, 4 Sep. 2025
In addition to maintaining good oral hygiene habits at home, such as brushing and flossing, experts recommend tactics like drinking plenty of water, limiting snacks and sugary foods, and quitting smoking to help prevent cavities.
—Cristina Mutchler, Verywell Health, 4 Sep. 2025
Here’s to hoping Terri and Mel’s relationship is all smiles and no cavities.
—Liza Esquibias, PEOPLE, 4 Sep. 2025
See All Example Sentences for cavity
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Monisha Ravisetti, Space.com, 10 Sep. 2025
Schumann Resonance Time Acceleration Schumann resonances are natural, low-frequency electromagnetic hums that form in the cavity between Earth’s surface and the ionosphere (50-600 miles above the surface).
—Kaif Shaikh, Interesting Engineering, 4 Sep. 2025
In addition to maintaining good oral hygiene habits at home, such as brushing and flossing, experts recommend tactics like drinking plenty of water, limiting snacks and sugary foods, and quitting smoking to help prevent cavities.
—Cristina Mutchler, Verywell Health, 4 Sep. 2025
Here’s to hoping Terri and Mel’s relationship is all smiles and no cavities.
—Liza Esquibias, PEOPLE, 4 Sep. 2025
See All Example Sentences for cavity
Cite this Entry
“Cavity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cavity. Accessed 17 Sep. 2025.
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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