| aura | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aureole, gloriole, glory, halo, nimbus |
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| (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: air, atmosphere |
| (noun) a sensation (as of a cold breeze or bright light) that precedes the onset of certain disorders such as a migraine attack or epileptic seizure | - |
| aureole | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, gloriole, glory, halo, nimbus |
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| (noun) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse | Synonyms: corona |
| auricle | (noun) a small conical pouch projecting from the upper anterior part of each atrium of the heart | Synonyms: atrial auricle, auricula atrii |
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| (noun) the externally visible cartilaginous structure of the external ear | Synonyms: ear, pinna |
| auricula | (noun) a pouch projecting from the top front of each atrium of the heart | Synonyms: auricular appendage, auricular appendix |
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| (noun) yellow-flowered primrose native to Alps; commonly cultivated | Synonyms: bear's ear, Primula auricula |
| auriculare | (noun) the craniometric point at the center of the opening of the external acoustic meatus | Synonyms: auricular point |
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| auriscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auroscope, otoscope |
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| aurochs | (noun) large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle | Synonyms: Bos primigenius, urus |
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| (noun) European bison having a smaller and higher head than the North American bison | Synonyms: Bison bonasus, wisent |
| aurora | (noun) an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force | - |
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| (noun) the first light of day | Synonyms: break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunrise, sunup |
| auroscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, otoscope |
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