an·trum ( n tr m)n. pl. an·tra (-tr ) 1. A cavity or chamber, especially one in a bone. 2. Either of the sinuses in the bones of the upper jaw, opening into the nasal cavity. [Late Latin, cavity in the body, from Latin, cave, from Greek antron.] an tral adj. |
antrum
Noun
pl -tra Anat a natural cavity, esp. in a bone [Latin: cave]
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  antrum - a natural cavity or hollow in a bone |
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