Definition

1. Noun:
   • A natural cavity or hollow in a bone: An anatomical term for a chamber or cavity within a bone, often filled with air or fluid. This is the primary and most common usage in medical and anatomical contexts.

Usage Examples

• Noun:
  • The maxillary antrum is another name for the maxillary sinus.
  • The surgeon examined the bony antrum for any signs of infection.

Advanced Usage

• "Pyloric antrum": Refers specifically to the lower portion of the stomach, which is a cavity leading into the duodenum.
  • The biopsy was taken from the pyloric antrum.
• "Antral" (adjective): Pertaining to an antrum.
  • The scan showed antral thickening.

Variants and Related Words

• Antra (n): The plural form of antrum.
  • The CT scan revealed cysts in both antra.
• Antrostomy (n): A surgical procedure to create an opening into an antrum.
• Antritis (n): Inflammation of an antrum, particularly a sinus.

Synonyms

• Cavity: A hollow space.
• Sinus: A cavity within a bone or other tissue, especially one connected to the nostrils. (Note: While related, "sinus" is often used for specific air-filled cavities, whereas "antrum" can be more general.)
• Chamber: An enclosed space or compartment.

Related Phrases

• Antrum of Highmore: An older term for the maxillary sinus.
  • The infection was localized in the antrum of Highmore.

Noun

1. a natural cavity or hollow in a bone