Definition of antrum in US English:

antrum

nounPlural antra

Anatomy
  • 1A natural chamber or cavity in a bone or other anatomical structure.

    • ‘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.’
    • ‘Then, a fluid-filled space develops, to form the antrum of a tertiary follicle.’
    • ‘Cholesterol granuloma is usually associated with chronic middle ear disease and is common in the mastoid antrum and air cells of the temporal bone.’
    • ‘The cumulus projects into a single large fluid-filled space, the antrum, formed from the coalescence of the smaller spaces noted previously.’
    space, chamber, hollow, hole, pocket, pouch
    View synonyms
    1. 1.1 The part of the stomach just inside the pylorus.
      • ‘The antrum (ie, lower one-third of the stomach) is important for two main reasons.’
      • ‘Surgical resection of the antrum and first duodenum was performed.’
      • ‘The esophagus, antrum, pylorus, and duodenum were unremarkable.’
      • ‘The gastroenterologist should map the stomach with adequate sampling of the antrum, corpus, and cardia.’
      • ‘Multiple biopsies were taken from the duodenum, the gastric antrum, and the distal esophagus.’

Origin

Early 19th century: from Latin, from Greek antron ‘cave’.

Pronunciation

antrum

/ˈæntrəm//ˈantrəm/