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
Even with the rise of fluoride in toothpaste and other products, it’s credited with a 25% decrease in cavities.
—
Anna Clark, ProPublica, 13 Oct. 2025
Advertisement In experiments that began in the 1980s and developed over the ensuing 15 years, the scientists developed frameworks using metals and organic molecules that contained cavities large enough for gases and other materials to flow through.
—Connor Greene, Time, 9 Oct. 2025
But unlike diamonds, where the molecular structure is extremely compact, Robson’s material contained a huge number of large cavities, suggesting this could lead to the creation of new materials.
—Katie Hunt, CNN Money, 8 Oct. 2025
Susumu Kitagawa, Richard Robson, and Omar Yaghi discovered that copper ions could be used to create a crystal with large cavities within it, which was porous to smaller atoms and molecules but blocked larger ones.
—Tom Chivers, semafor.com, 8 Oct. 2025
See All Example Sentences for cavity
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Anna Clark, ProPublica, 13 Oct. 2025
Advertisement In experiments that began in the 1980s and developed over the ensuing 15 years, the scientists developed frameworks using metals and organic molecules that contained cavities large enough for gases and other materials to flow through.
—Connor Greene, Time, 9 Oct. 2025
But unlike diamonds, where the molecular structure is extremely compact, Robson’s material contained a huge number of large cavities, suggesting this could lead to the creation of new materials.
—Katie Hunt, CNN Money, 8 Oct. 2025
Susumu Kitagawa, Richard Robson, and Omar Yaghi discovered that copper ions could be used to create a crystal with large cavities within it, which was porous to smaller atoms and molecules but blocked larger ones.
—Tom Chivers, semafor.com, 8 Oct. 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 19 Oct. 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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