| austenite | (noun) a solid solution of ferric carbide or carbon in iron; cools to form pearlite or martensite | - |
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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 |
| austerely | (adverb) in an austere fashion | - |
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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 | (adjective) of the south or coming from the south | - |
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| (noun) the basic unit of money in Argentina; equal to 100 centavos | - |
| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| catacaustic | (noun) a caustic curve formed by light reflecting from a curved surface. | - |
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| caustic | (adjective) of a substance, especially a strong acid; capable of destroying or eating away by chemical action | Synonyms: corrosive, erosive, mordant, vitriolic |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, sulfurous, sulphurous, virulent, vitriolic |
| (noun) the envelope of light rays reflected or refracted by a curved surface or object | - |
| (noun) any chemical substance that burns or destroys living tissue | - |
| caustically | (adverb) in a caustic vitriolic manner | Synonyms: vitriolically |
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| 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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| claustrophobic | (adjective) suffering from claustrophobia; abnormally afraid of closed-in places | - |
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| (adjective) uncomfortably closed or hemmed in | - |
| 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 |
| (verb) wear out completely | Synonyms: beat, tucker, tucker out, wash up |
| (verb) eliminate (a substance) | Synonyms: discharge, eject, expel, release |
| (verb) use up the whole supply of | - |
| (verb) use up (resources or materials) | Synonyms: consume, deplete, eat, eat up, expend, run through, use, use up, wipe out |
| (verb) deplete | Synonyms: play out, run down, sap, tire |
| exhausted | (adjective) depleted of energy, force, or strength | Synonyms: spent |
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| (adjective) drained physically | - |
| (adjective) drained of energy or effectiveness; extremely tired; completely exhausted | Synonyms: dog-tired, fagged, fatigued, gone, played out, spent, washed-out, worn-out, worn out |
| exhaustible | (adjective) capable of being used up | - |
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| (adjective) capable of being used up; capable of being exhausted | - |
| exhausting | (adjective) having a debilitating effect | Synonyms: draining |
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| (adjective) producing exhaustion | Synonyms: tiring, wearing, wearying |
| 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 | - |
| exhaustive | (adjective) performed comprehensively and completely; not superficial or partial | Synonyms: thorough, thoroughgoing |
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| exhaustively | (adverb) in an exhaustive manner | Synonyms: thoroughly |
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| 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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| inexhaustible | (adjective) incapable of being entirely consumed or used up | - |
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| (adjective) that cannot be entirely consumed or used up | Synonyms: unlimited |
| inexhaustibly | (adverb) with indefatigable energy | Synonyms: indefatigably, tirelessly |
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| unexhausted | (adjective) not used up completely | - |
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