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
Small owls like screech owls often sleep in tree cavities or nest boxes, while barn owls live up to their name by seeking out barns and empty buildings.
—
Brandee Gruener, Southern Living, 2 Jan. 2026
The detection process relies on a microwave cavity made of copper that is immersed in a strong magnetic field.
—Aman Tripathi, Interesting Engineering, 31 Dec. 2025
While more studies are needed to prove that marijuana smoke can cause mouth cancers, the reality is that breathing in a burning material of any kind is not good for the lungs and mouth, said Clonan, who led a January study that found a high risk for cavities and tooth loss among marijuana users.
—Sandee Lamotte, CNN Money, 29 Dec. 2025
Emergency personnel responded and found Phelps had suffered a single gunshot wound in her right upper arm and the bullet had gone into her chest cavity below her armpit.
—Mike Snider, USA Today, 27 Dec. 2025
See All Example Sentences for cavity
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Brandee Gruener, Southern Living, 2 Jan. 2026
The detection process relies on a microwave cavity made of copper that is immersed in a strong magnetic field.
—Aman Tripathi, Interesting Engineering, 31 Dec. 2025
While more studies are needed to prove that marijuana smoke can cause mouth cancers, the reality is that breathing in a burning material of any kind is not good for the lungs and mouth, said Clonan, who led a January study that found a high risk for cavities and tooth loss among marijuana users.
—Sandee Lamotte, CNN Money, 29 Dec. 2025
Emergency personnel responded and found Phelps had suffered a single gunshot wound in her right upper arm and the bullet had gone into her chest cavity below her armpit.
—Mike Snider, USA Today, 27 Dec. 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 7 Jan. 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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