Relating to or situated within an antrum, which is a cavity or chamber in the body, most commonly referring to the maxillary antrum in the skull.
From 'antrum' (a cavity), which comes from Latin and Greek 'antron' meaning 'cave.' The suffix '-al' makes it an adjective. Medical usage became common in anatomical and surgical literature in the 18th-19th centuries.
The maxillary antrum (a cavity in your cheekbone) is why sinus infections can cause facial pain—it's a hollow space connected to your nasal passages, and when it gets infected, the pressure builds up in that enclosed chamber.
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