| amphisbaena | (noun) (classical mythology) a serpent with a head at each end of its body | - |
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| andrena | (noun) a bee that is a member of the genus Andrena | Synonyms: andrenid, mining bee |
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| 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 |
| catena | (noun) a chain of connected ideas or passages or objects so arranged that each member is closely related to the preceding and following members (especially a series of patristic comments elucidating Christian dogma) | - |
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| dracaena | (noun) an agave that is often cultivated for its decorative foliage | - |
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| euglena | (noun) minute single-celled green freshwater organism having a single flagella; often classed as algae | - |
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| galena | (noun) soft blue-grey mineral; lead sulfide; a major source of lead | - |
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| hyaena | (noun) doglike nocturnal mammal of Africa and southern Asia that feeds chiefly on carrion | Synonyms: hyena |
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| hyena | (noun) doglike nocturnal mammal of Africa and southern Asia that feeds chiefly on carrion | Synonyms: hyaena |
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| melaena | (noun) abnormally dark tarry feces containing blood (usually from gastrointestinal bleeding) | Synonyms: melena |
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| melena | (noun) abnormally dark tarry feces containing blood (usually from gastrointestinal bleeding) | Synonyms: melaena |
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| novena | (noun) a Roman Catholic devotion consisting of prayers on nine consecutive days | - |
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| ozaena | (noun) a chronic disease of the nose characterized by a foul-smelling nasal discharge and atrophy of nasal structures | Synonyms: ozena |
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| ozena | (noun) a chronic disease of the nose characterized by a foul-smelling nasal discharge and atrophy of nasal structures | Synonyms: ozaena |
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| subpoena | (noun) a writ issued by court authority to compel the attendance of a witness at a judicial proceeding; disobedience may be punishable as a contempt of court | Synonyms: subpoena ad testificandum |
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| tetrahymena | (noun) relative of the paramecium; often used in genetics research | - |
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| vena | (noun) a blood vessel that carries blood from the capillaries toward the heart | Synonyms: vein, venous blood vessel |
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| verbena | (noun) any of numerous tropical or subtropical American plants of the genus Verbena grown for their showy spikes of variously colored flowers | Synonyms: vervain |
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