noun
- a cavity or chamber within a bone or other body part
Usage: medical; anatomy
Examples
- The maxillary antrum is the largest of the paranasal sinuses.
- Infection in the antrum can cause severe facial pain.
- The surgeon examined the antrum using an endoscope.
- Fluid had accumulated in the patient’s antrum.
- The antrum appeared normal on the CT scan.
- Chronic inflammation affected the lining of the antrum.