What does antrum mean?
An antrum is a natural cavity or chamber found within the body, a term borrowed directly from Latin where it meant a cave or grotto. In modern medicine the word appears in several specific anatomical contexts: the gastric antrum is the lower portion of the stomach that grinds food before passing it into the small intestine; the maxillary antrum, also called the antrum of Highmore, is the largest of the paranasal sinuses located in the cheekbone; and the mastoid antrum is an air-filled space in the temporal bone behind the ear. Because these structures are clinically significant — involved in conditions ranging from gastritis to sinusitis to middle-ear infections — the term is common in medical literature but rarely encountered elsewhere. The adjective form 'antral' describes anything relating to an antrum, as in antral gastritis. For general readers, the word offers a vivid reminder that anatomists have long described the body's interior spaces using the language of caves and hollows.
nounA natural cavity or chamber in the body, especially one within a bone; in anatomy, most commonly the lower part of the stomach (the gastric antrum) or the maxillary sinus (the antrum of Highmore).
- In anatomy, a natural cavity or chamber within the body, especially a bone cavity.
- Specifically, the lower portion (distal part) of the stomach, known as the gastric antrum.
- Specifically, the maxillary sinus, historically called the antrum of Highmore.
"The surgeon located the lesion in the antrum of the stomach during the endoscopy."
"Food empties from the antrum of the stomach into the duodenum through the pyloric sphincter."
"Chronic sinusitis often involves inflammation of the maxillary antrum."
The Latin-derived plural 'antra' is standard in medical writing; 'antrums' is rare and generally avoided in professional contexts.
"Both maxillary antra were opacified on the CT scan."
The word 'antrum' literally means 'cave' — your stomach's lower region and your sinuses are, etymologically speaking, little caverns inside you.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of antrum
Antrum comes directly from the Latin word 'antrum', meaning a cave or grotto, which itself derives from the Greek 'antron' with the same meaning. The term entered English medical vocabulary in the early modern period as anatomists adopted Latin names for bodily cavities. Its cognates include other Latin-derived words relating to hollow spaces, and its Greek root connects it to classical descriptions of natural caverns. The adjective 'antral' was formed later by adding the standard Latinate adjectival suffix.
Related word forms
How antrum is actually used
Antrum is a technical term used almost exclusively in medical, anatomical, and dental contexts. It is not part of everyday vocabulary. The plural form 'antra' follows Latin declension patterns and is preferred over 'antrums' in professional writing.
Easily confused with antrum
An atrium is a chamber of the heart or a central hall of a building, whereas an antrum is a cavity such as those found in bones or the lower stomach.
A ventricle is a pumping chamber of the heart or brain, while an antrum refers to a hollow space like the lower portion of the stomach.