plural cavities
1
: a hole or space inside something
Some birds nest in tree cavities.
the abdominal/chest/nasal cavity
2
: a hole formed in a tooth by decay
I had two cavities filled at the dentist's.
Cite this Entry
“Cavity.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/cavity. Accessed 20 Jun. 2026.
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