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Definition of Antrum
1. Noun. A natural cavity or hollow in a bone.
Definition of Antrum
1. n. A cavern or cavity, esp. an anatomical cavity or sinus
Definition of Antrum
1. Noun. (biology) A bodily cavity, especially one having bony walls, especially one in the sinuses. ¹
¹ Source: wiktionary.com
Definition of Antrum
1. a cavity in a bone [n -TRA or -TRUMS]
Medical Definition of Antrum
1. A general term for cavity or chamber which may have specific meaning in reference certain organs or sites in the body. The antrum of the stomach (gastric antrum) is a portion before the outlet which is lined by mucosa which does not produce acid. The paranasal sinuses can be referred to as the frontal antrum, ethmoid antrum, and maxillary antrum. (12 Dec 1998)