Definition of antrum in US English:

antrum

noun

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

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