| neuropteran | (noun) insect having biting mouthparts and four large membranous wings with netlike veins | Synonyms: neuropteron, neuropterous insect |
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| neuropteron | (noun) insect having biting mouthparts and four large membranous wings with netlike veins | Synonyms: neuropteran, neuropterous insect |
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| neurosarcoma | (noun) a malignant neoplasm of nerve tissue and fibrous tissue and connective tissue | Synonyms: malignant neuroma |
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| neuroscience | (noun) the scientific study of the nervous system | - |
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| neuroscientist | (noun) a neurobiologist who specializes in the study of the brain | - |
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| neurosis | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neuroticism, psychoneurosis |
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| neurosurgeon | (noun) someone who does surgery on the nervous system (especially the brain) | Synonyms: brain surgeon |
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| neurosurgery | (noun) any surgery that involves the nervous system (brain or spinal cord or peripheral nerves) | - |
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| neurosyphilis | (noun) syphilis of the central nervous system | - |
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| neurotic | (adjective) affected with emotional disorder | Synonyms: psychoneurotic |
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| (adjective) characteristic of or affected by neurosis | - |
| (noun) a person suffering from neurosis | Synonyms: mental case, psychoneurotic |
| neurotically | (adverb) in a neurotic manner | - |
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| neuroticism | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neurosis, psychoneurosis |
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| neurotoxic | (adjective) poisonous to nerves or nerve cells | - |
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| neurotoxin | (noun) any toxin that affects neural tissues | Synonyms: neurolysin |
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| neurotransmitter | (noun) a neurochemical that transmits nerve impulses across a synapse | - |
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| neurotropic | (adjective) (of a virus, toxin, or chemical) tending to attack or affect the nervous system preferentially | - |
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| neurotropism | (noun) an affinity for neural tissues | - |
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| pleurocarp | (noun) a moss having the archegonium or antheridium on a short side branch rather than the main stalk | Synonyms: pleurocarpous moss |
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| pleurocarpous | (adjective) (of mosses) having the archegonia on short lateral branches | - |
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| pleurodont | (noun) an animal having teeth fused with the inner surface of the alveolar ridge without sockets | - |
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| pleurodynia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: costalgia, pleuralgia |
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| pleuropneumonia | (noun) pleurisy and pneumonia | - |
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| pleurothallis | (noun) any of numerous small tufted orchids of the genus Pleurothallis having leathery to fleshy leaves and racemes of 1 to many small flowers | - |
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| politburo | (noun) the chief executive and political committee of the Communist Party | - |
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| psychoneurosis | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neurosis, neuroticism |
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| psychoneurotic | (adjective) affected with emotional disorder | Synonyms: neurotic |
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| (noun) a person suffering from neurosis | Synonyms: mental case, neurotic |
| rapturous | (adjective) feeling great rapture or delight | Synonyms: ecstatic, enraptured, rapt, rhapsodic |
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| rapturously | (adverb) in an ecstatic manner | Synonyms: ecstatically, rhapsodically |
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| rigourousness | (noun) something hard to endure | Synonyms: asperity, grimness, hardship, rigor, rigorousness, rigour, severeness, severity |
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| (noun) excessive sternness | Synonyms: hardness, harshness, inclemency, rigor, rigorousness, rigour, severeness, severity, stiffness |
| sauropod | (noun) very large herbivorous dinosaur of the Jurassic and Cretaceous having a small head on a long neck and tail and five-toed limbs; largest known land animal | Synonyms: sauropod dinosaur |
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| sulfurous | (adjective) of or related to or containing sulfur or derived from sulfur | Synonyms: sulphurous |
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| (adjective) characterized by oppressive heat and humidity | Synonyms: stifling, sulphurous, sultry |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulphurous, virulent, vitriolic |
| sulphurous | (adjective) of or related to or containing sulfur or derived from sulfur | Synonyms: sulfurous |
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| (adjective) characterized by oppressive heat and humidity | Synonyms: stifling, sulfurous, sultry |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, virulent, vitriolic |
| tauromachy | (noun) the activity at a bullfight | Synonyms: bullfighting |
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| thysanuron | (noun) primitive wingless insects: bristletail | Synonyms: thysanuran insect |
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| torturous | (adjective) extremely painful | Synonyms: agonising, agonizing, excruciating, harrowing, torturesome, torturing |
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| torturously | (adverb) in a very painful manner | Synonyms: agonizingly, excruciatingly |
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| unadventurous | (adjective) lacking in boldness | - |
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| unglamourous | (adjective) not challenging; dull and lacking excitement | Synonyms: commonplace, humdrum, prosaic, unglamorous |
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| unneurotic | (adjective) not neurotic | - |
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| urobilin | (noun) brown bile pigment formed from urobilinogens and found in feces and in small amounts in urine | - |
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| urobilinogen | (noun) a chromogen formed in the intestine from the breakdown of bilirubin; yields urobilins on oxidation; some is excreted in the feces and some is resorbed and excreted in bile or urine | Synonyms: stercobilinogen |
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| urocele | (noun) extravasation of urine into the scrotal sac | - |
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| urochesia | (noun) passage of urine from the anus | Synonyms: urochezia |
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| urochezia | (noun) passage of urine from the anus | Synonyms: urochesia |
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| urochord | (noun) a notochord of a larval tunicate typically confined to the caudal region | - |
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| (noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva | Synonyms: tunicate, urochordate |
| urochordate | (noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva | Synonyms: tunicate, urochord |
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| urodele | (noun) amphibians that resemble lizards | Synonyms: caudate |
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| urodynia | (noun) pain during urination | - |
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| urogenital | (adjective) of or relating to the urinary and reproductive systems | - |
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| urokinase | (noun) protease produced in the kidney that converts plasminogen to plasmin and so initiates fibrinolysis | Synonyms: plasminogen activator |
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| urolith | (noun) a urinary stone | - |
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| urologist | (noun) a specialist in urology | - |
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| urology | (noun) the branch of medicine that deals with the diagnosis and treatment of disorders of the urinary tract or urogenital system | Synonyms: urogenital medicine |
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| uropathy | (noun) any pathology of the urinary tract | - |
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| uropygium | (noun) posterior part of a bird's body from which the tail feathers grow | - |
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| vapourous | (adjective) filled with vapor | Synonyms: miasmal, miasmic, vaporous |
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| (adjective) resembling or characteristic of vapor | Synonyms: vaporific, vaporish, vaporous, vapourific, vapourish |
| (adjective) so thin as to transmit light | Synonyms: cobwebby, diaphanous, filmy, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous |
| vapourousness | (noun) cloudiness resulting from haze or mist or vapor | Synonyms: haziness, mistiness, steaminess, vaporousness |
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| venturous | (adjective) disposed to venture or take risks | Synonyms: audacious, daring, venturesome |
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| vulturous | (adjective) living by preying on other animals especially by catching living prey | Synonyms: predatory, rapacious, raptorial, ravening, vulturine |
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