| auscultatory | (adjective) of or relating to auscultation | - |
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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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| austenitic | (adjective) composed of austenite | - |
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| austere | (adjective) practicing great self-denial | Synonyms: ascetic, ascetical, spartan |
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| (adjective) of a stern or strict bearing or demeanor; forbidding in aspect | Synonyms: stern |
| (adjective) severely simple | Synonyms: severe, stark, stern |
| austral | (adjective) of the south or coming from the south | - |
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| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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