Definition of antrum in English:


Syllabification: an·trum
Pronunciation: /ˈantrəm

noun (plural antra /-trə/)

  • 1A natural chamber or cavity in a bone or other anatomical structure.
    More example sentences
    • Cholesterol granuloma is usually associated with chronic middle ear disease and is common in the mastoid antrum and air cells of the temporal bone.
    • Thus removal of a small cholesteatoma may allow for reconstruction of the outer attic wall or creation of a cavity that extends to or just beyond the mastoid antrum.
    • It's endoderm ultimately forms the lining of the auditory tube, tympanic cavity and mastoid antrum.
  • 1.1The part of the stomach just inside the pylorus.
    More example sentences
    • Multiple biopsies were taken from the duodenum, the gastric antrum, and the distal esophagus.
    • Surgical resection of the antrum and first duodenum was performed.
    • The gastroenterologist should map the stomach with adequate sampling of the antrum, corpus, and cardia.



More example sentences
  • Upper endoscopy evaluations of 13 of the rosacea patients revealed that 8 had gastrointestinal disorders including antral gastritis, chronic atrophic gastritis, and duodenal ulcers.
  • Endoscopic ultrasonography showed a thickened antral wall with a mass in the gastric antrum.
  • Three antral biopsies were obtained within 2-5cm from the pylorus.


early 19th century: from Latin, from Greek antron 'cave'.

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elaborate ornamentation of a vocal melody