cavity

noun

cav·​i·​ty ˈka-və-tē 

plural cavities

1

: an unfilled space within a mass

especially : a hollowed-out space

2

: an area of decay in a tooth : caries

Synonyms of cavity

• hole
• dent
• pit
• concavity

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

So instead, Ziegfeld brought video of their snake-charming act, then hammered home their carnival sideshow bona fides by knocking a nail into their own nasal cavity in what was called the Human Blockhead act. — ABC News, 5 Sep. 2026

Alcohol played a major role in deaths from malignant tumors in the head and neck, including lip, oral cavity, pharynx, larynx and cancer of the esophagus. — Sandee Lamotte, CNN Money, 3 Sep. 2026

Light traveling through this cavity produces a characteristic interference pattern. — Pawel Maniewski, New Atlas, 2 Sep. 2026

Sound waves excite the air in the cavities, forcing out the oscillating air to generate thrust. — ArsTechnica, 1 Sep. 2026

Word History

Etymology

borrowed from Middle French & Late Latin; Middle French cavité, borrowed from Late Latin cavitāt-, cavitās, from Latin cavus "hollow, concave" + -itāt-, -itās -ity — more at hole entry 1

First Known Use

1541, in the meaning defined at sense 1

Phrases Containing cavity

• abdominal cavity
• body cavity
• pelvic cavity
• segmentation cavity
• spinal cavity
• thoracic cavity

Rhymes for cavity

• gravity
• concavity
• depravity
• intracavity
• microgravity
• supergravity

Kids 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

Medical Definition

cavity

noun

cav·​i·​ty ˈkav-ət-ē 

plural cavities

1

: an unfilled space within a mass

2

: an area of decay in a tooth : caries