| austenite | (noun) a solid solution of ferric carbide or carbon in iron; cools to form pearlite or martensite | - |
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| austereness | (noun) extreme plainness | Synonyms: severeness, severity |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| austral | (noun) the basic unit of money in Argentina; equal to 100 centavos | - |
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| australopithecine | (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
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| catacaustic | (noun) a caustic curve formed by light reflecting from a curved surface. | - |
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| caustic | (noun) the envelope of light rays reflected or refracted by a curved surface or object | - |
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| (noun) any chemical substance that burns or destroys living tissue | - |
| claustrophobe | (noun) a person suffering from claustrophobia | - |
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| claustrophobia | (noun) a morbid fear of being closed in a confined space | - |
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| claustrum | (noun) a layer of grey matter in the brain adjacent to the lenticular nucleus | - |
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| encaustic | (noun) a paint consisting of pigment mixed with melted beeswax; it is fixed with heat after application | - |
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| exhaust | (noun) system consisting of the parts of an engine through which burned gases or steam are discharged | Synonyms: exhaust system |
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| (noun) gases ejected from an engine as waste products | Synonyms: exhaust fumes, fumes |
| exhaustion | (noun) the act of exhausting something entirely | - |
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| (noun) serious weakening and loss of energy | Synonyms: debilitation, enervation, enfeeblement |
| (noun) extreme fatigue | - |
| haustorium | (noun) a root-like attachment in parasitic plants that penetrates and obtains food from the host | - |
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| holocaust | (noun) an act of mass destruction and loss of life (especially in war or by fire) | - |
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| inexhaustibility | (noun) The state or condition of being impossible to exhaust; of being unlimited. | - |
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