| arena | (noun) a playing field where sports events take place | Synonyms: scene of action |
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| (noun) a large structure for open-air sports or entertainments | Synonyms: bowl, sports stadium, stadium |
| (noun) the central area of an ancient Roman amphitheater where contests and spectacles were held; especially an area that was strewn with sand | - |
| (noun) a particular environment or walk of life | Synonyms: area, domain, field, orbit, sphere |
| arenaceous | (adjective) resembling or containing or abounding in sand; or growing in sandy areas | Synonyms: sandlike, sandy |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| arenicolous | (adjective) growing or living or burrowing in sand | - |
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