Cavity
Cavity — an unfilled space within a mass, especially: a hollowed-out space. It is a hole in a surface or a hollow inside something.
Anatomy. a hollow space within the body, an organ, a bone, etc.
A cavity is also a hollow place in a tooth caused by decay. A cavity is more generally any hollow place or crater, as in When the old building was torn down, all that was left was a huge cavity in the ground.
A cavity is also any other hole, divet, or pit in the body, such as the spinal cavity, which surrounds your spinal cord.
Сavity. (2024). Merriam-Webster Dictionary. Retrieved from: https://www.merriam-webster.com/dictionary/cavity
Сavity. (2021). Cambridge Advanced Learner's Dictionary & Thesaurus Cambridge University Press. Retrieved from: https://dictionary.cambridge.org/dictionary/english/
More about cavity. (2023). Dictionary.com. Retrieved from: https://www.dictionary.com/browse/cavity