| athodyd | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: atherodyde, flying drainpipe, ramjet, ramjet engine |
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| batholite | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholith, pluton, plutonic rock |
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| batholith | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholite, pluton, plutonic rock |
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| bathometer | (noun) an instrument that measures the depth of water | Synonyms: bathymeter |
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| bathos | (noun) triteness or triviality of style | - |
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| (noun) a change from a serious subject to a disappointing one | Synonyms: anticlimax |
| (noun) insincere pathos | Synonyms: mawkishness |
| boathouse | (noun) a shed at the edge of a river or lake; used to store boats | - |
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| cathode | (noun) a negatively charged electrode that is the source of electrons entering an electrical device | - |
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| (noun) the positively charged terminal of a voltaic cell or storage battery that supplies current | - |
| catholicity | (noun) the quality of being universal; existing everywhere | Synonyms: universality |
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| catholicon | (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: cure-all, nostrum, panacea |
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| cathouse | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, bordello, brothel, house of ill repute, house of prostitution, sporting house, whorehouse |
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| fathom | (noun) a linear unit of measurement (equal to 6 feet) for water depth | Synonyms: fthm |
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| (noun) (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore | Synonyms: fthm |
| fathometer | (noun) depth finder for determining depth of water or a submerged object by means of ultrasound waves | Synonyms: sonic depth finder |
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| gnathopod | (noun) One of a set of three paired appendages on the thorax of a decapod crustacean, located just posterior to the maxillae and used in feeding. | Synonyms: maxilliped |
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| gnathostome | (noun) a vertebrate animal possessing true jaws | - |
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| hackathon | (noun) an event involving a marathon coding session | - |
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| hydathode | (noun) a pore that exudes water on the surface or margin of a leaf of higher plants | Synonyms: water pore, water stoma |
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| immunopathology | (noun) the branch of immunology that deals with pathologies of the immune system | - |
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| marathon | (noun) any long and arduous undertaking | Synonyms: endurance contest |
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| (noun) a footrace of 26 miles 385 yards | - |
| marathoner | (noun) someone who participates in long-distance races (especially in marathons) | Synonyms: long-distance runner, marathon runner, road runner |
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| palaeopathology | (noun) the study of disease of former times (as inferred from fossil evidence) | Synonyms: paleopathology |
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| paleopathology | (noun) the study of disease of former times (as inferred from fossil evidence) | Synonyms: palaeopathology |
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| parathormone | (noun) hormone synthesized and released into the blood stream by the parathyroid glands; regulates phosphorus and calcium in the body and functions in neuromuscular excitation and blood clotting | Synonyms: parathyroid hormone |
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| pathogen | (noun) any disease-producing agent (especially a virus or bacterium or other microorganism) | - |
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| pathogenesis | (noun) the origination and development of a disease | - |
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| pathologist | (noun) a doctor who specializes in medical diagnosis | Synonyms: diagnostician |
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| pathology | (noun) the branch of medical science that studies the causes and nature and effects of diseases | - |
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| (noun) any deviation from a healthy or normal condition | - |
| pathos | (noun) a quality that arouses emotions (especially pity or sorrow) | Synonyms: poignancy |
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| (noun) a style that has the power to evoke feelings | - |
| (noun) a feeling of sympathy and sorrow for the misfortunes of others | Synonyms: commiseration, pity, ruth |
| photocathode | (noun) a cathode that emits electrons when illuminated | - |
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| psychopathology | (noun) the branch of medicine dealing with the diagnosis and treatment of mental disorders | Synonyms: psychiatry, psychological medicine |
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| (noun) the branch of psychology concerned with abnormal behavior | Synonyms: abnormal psychology |
| rathole | (noun) a small dirty uncomfortable room | - |
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| (noun) a hole (as in the wall of a building) made by rats | - |