antrum
English Thesaurus
1. a natural cavity or hollow in a bone (noun.body)
| hypernym | : | bodily cavity, cavity, cavum, |
| definition | : | (anatomy) a natural hollow or sinus within the body (noun.body) |
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| hypernym | : | bodily cavity, cavity, cavum, |
| definition | : | (anatomy) a natural hollow or sinus within the body (noun.body) |