| acanthosis | (noun) an abnormal but benign thickening of the prickle-cell layer of the skin (as in psoriasis) | - |
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| anamorphosis | (noun) a distorted projection or perspective; especially an image distorted in such a way that it becomes visible only when viewed in a special manner | Synonyms: anamorphism |
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| (noun) the evolution of one type of organism from another by a long series of gradual changes | Synonyms: anamorphism |
| archosaur | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaurian, archosaurian reptile |
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| archosaurian | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
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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 |
| benthos | (noun) organisms (plants and animals) that live at or near the bottom of a sea, lake, river or stream | - |
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| (noun) a region including the bottom of the sea and the littoral zones | Synonyms: benthic division, benthonic zone |
| boothose | (noun) protective stockings worn with or in place of boots | - |
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| bronchoscope | (noun) a slender tubular instrument used to examine the bronchial tubes | - |
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| bronchospasm | (noun) a spasm of the bronchi that makes exhalation difficult and noisy; associated with asthma and bronchitis | - |
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| chosen | (noun) an exclusive group of people | Synonyms: elect |
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| (noun) one who is the object of choice; who is given preference | - |
| cirrhosis | (noun) a chronic disease interfering with the normal functioning of the liver; the major cause is chronic alcoholism | Synonyms: cirrhosis of the liver |
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| cohosh | (noun) a plant of the genus Actaea having acrid poisonous berries | Synonyms: baneberry, herb Christopher |
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| corythosaur | (noun) duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet | Synonyms: corythosaurus |
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| corythosaurus | (noun) duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet | Synonyms: corythosaur |
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| edaphosaurus | (noun) heavy-bodied reptile with a dorsal sail or crest; of the late Paleozoic | - |
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| epanorthosis | (noun) immediate rephrasing for intensification or justification | - |
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| ethos | (noun) (anthropology) the distinctive spirit of a culture or an era | - |
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| ethosuximide | (noun) an anticonvulsant drug (trade names Emeside and Zarontin) used to treat petit mal epilepsy | Synonyms: Emeside, Zarontin |
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| ghost | (noun) a mental representation of some haunting experience | Synonyms: shade, specter, spectre, spook, wraith |
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| (noun) a suggestion of some quality | Synonyms: touch, trace |
| (noun) the visible disembodied soul of a dead person | - |
| (noun) a writer who gives the credit of authorship to someone else | Synonyms: ghostwriter |
| ghostfish | (noun) eellike Atlantic bottom fish with large almost vertical mouth | Synonyms: Cryptacanthodes maculatus, wrymouth |
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| ghostliness | (noun) strangeness by virtue of being mysterious and inspiring fear | Synonyms: eeriness |
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| ghostwriter | (noun) a writer who gives the credit of authorship to someone else | Synonyms: ghost |
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| gnathostome | (noun) a vertebrate animal possessing true jaws | - |
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| graphospasm | (noun) muscular spasms of thumb and forefinger while writing with a pen or pencil | Synonyms: writer's cramp |
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| hemimetamorphosis | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetabolism, hemimetaboly |
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| hosanna | (noun) a cry of praise or adoration (to God) | - |
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| hose | (noun) socks and stockings and tights collectively (the British include underwear) | Synonyms: hosiery |
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| (noun) a flexible pipe for conveying a liquid or gas | Synonyms: hosepipe |
| (noun) man's close-fitting garment of the 16th and 17th centuries covering the legs and reaching up to the waist; worn with a doublet | - |
| hosepipe | (noun) a flexible pipe for conveying a liquid or gas | Synonyms: hose |
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| hosier | (noun) a tradesman who sells hosiery and (in England) knitwear | - |
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| hosiery | (noun) socks and stockings and tights collectively (the British include underwear) | Synonyms: hose |
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| hospice | (noun) a program of medical and emotional care for the terminally ill | - |
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| (noun) a lodging for travelers (especially one kept by a monastic order) | - |
| hospitableness | (noun) having a disposition that welcomes guests and is fond of entertaining | - |
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| hospital | (noun) a health facility where patients receive treatment | Synonyms: infirmary |
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| (noun) a medical institution where sick or injured people are given medical or surgical care | - |
| hospitalisation | (noun) placing in medical care in a hospital | Synonyms: hospital care, hospitalization |
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| hospitality | (noun) kindness in welcoming guests or strangers | Synonyms: cordial reception |
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| hospitalization | (noun) placing in medical care in a hospital | Synonyms: hospital care, hospitalisation |
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| (noun) insurance that pays all or part of a patient's hospital expense | Synonyms: hospitalization insurance |
| (noun) the condition of being treated as a patient in a hospital | - |
| (noun) a period of time when you are confined to a hospital | - |
| hospitaller | (noun) title of the member of any of several religious orders that cared for the sick in hospitals. | - |
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| host | (noun) an animal or plant that nourishes and supports a parasite; it does not benefit and is often harmed by the association | - |
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| (noun) (computer science) a computer that provides client stations with access to files and printers as shared resources to a computer network | Synonyms: server |
| (noun) a vast multitude | Synonyms: horde, legion |
| (noun) any organization that provides resources and facilities for a function or event | - |
| (noun) archaic terms for army | Synonyms: legion |
| (noun) the owner or manager of an inn | Synonyms: boniface, innkeeper |
| (noun) a person who acts as host at formal occasions (makes an introductory speech and introduces other speakers) | Synonyms: emcee, master of ceremonies |
| (noun) a person who invites guests to a social event (such as a party in his or her own home) and who is responsible for them while they are there | - |
| (noun) (medicine) recipient of transplanted tissue or organ from a donor | - |
| hostage | (noun) a prisoner who is held by one party to insure that another party will meet specified terms | Synonyms: surety |
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| hostel | (noun) inexpensive supervised lodging (especially for youths on bicycling trips) | Synonyms: student lodging, youth hostel |
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| (noun) a hotel providing overnight lodging for travelers | Synonyms: auberge, hostelry, inn, lodge |
| hosteller | (noun) a traveler who lodges in hostels | - |
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| (noun) an owner or manager of hotels | Synonyms: hotel manager, hotelier, hotelkeeper, hotelman |
| hostelry | (noun) a hotel providing overnight lodging for travelers | Synonyms: auberge, hostel, inn, lodge |
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| hostess | (noun) a woman innkeeper | - |
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| (noun) a woman steward on an airplane | Synonyms: air hostess, stewardess |
| (noun) a woman host | - |
| hostile | (noun) troops belonging to the enemy's military forces | - |
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| hostilities | (noun) fighting; acts of overt warfare | Synonyms: belligerency |
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| hostility | (noun) violent action that is hostile and usually unprovoked | Synonyms: aggression |
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| (noun) a hostile (very unfriendly) disposition | Synonyms: ill will |
| (noun) the feeling of a hostile person | Synonyms: enmity, ill will |
| (noun) a state of deep-seated ill-will | Synonyms: antagonism, enmity |
| hostler | (noun) someone employed in a stable to take care of the horses | Synonyms: groom, ostler, stableboy, stableman |
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| inhospitableness | (noun) having an unfriendly and inhospitable disposition | - |
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| (noun) the environmental condition in a region that lacks a favorable climate or terrain for life or growth | - |
| inhospitality | (noun) unkind and inconsiderate welcome | - |
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| kyphosis | (noun) The property of having an abnormal convex curvature in the cervical or lumbar regions of the spine. | - |
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| (noun) an abnormal backward curve to the vertebral column | Synonyms: humpback, hunchback |
| lederhosen | (noun) leather shorts often worn with suspenders; worn especially by men and boys in Bavaria | - |
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| lithosphere | (noun) the solid part of the earth consisting of the crust and outer mantle | Synonyms: geosphere |
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| merobenthos | (noun) benthos consisting of organisms in pre-adult stages that later become adult in the plankton. | - |
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| metamorphosis | (noun) a complete change of physical form or substance especially as by magic or witchcraft | - |
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| (noun) a striking change in appearance or character or circumstances | Synonyms: transfiguration |
| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metabolism |
| metempsychosis | (noun) after death the soul begins a new cycle of existence in another human body | Synonyms: rebirth |
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| microbenthos | (noun) microscopic benthic organisms that are less than 0.1 mm in size. | - |
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| nephoscope | (noun) a measuring instrument that uses a grid for measuring the altitude, direction, and velocity of movement of clouds | - |
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| nothosaur | (noun) extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming | - |
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| onychosis | (noun) any disease or disorder of the nails | - |
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| organophosphate | (noun) an insecticide that interferes with an insect's nervous system | - |
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| ornithosis | (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: parrot fever, psittacosis |
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| orthophosphate | (noun) a salt of phosphoric acid | Synonyms: inorganic phosphate, phosphate |
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| orthoscope | (noun) an ophthalmoscope with a layer of water to neutralize the refraction of the cornea | - |
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| pantyhose | (noun) a woman's tights consisting of underpants and stockings | - |
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| 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 |
| phosgene | (noun) a colorless poisonous gas that smells like new-mown hay; used in chemical warfare | - |
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| phosphatase | (noun) any of a group of enzymes that act as a catalyst in the hydrolysis of organic phosphates | - |
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| phosphate | (noun) carbonated drink with fruit syrup and a little phosphoric acid | - |
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| (noun) a salt of phosphoric acid | Synonyms: inorganic phosphate, orthophosphate |
| phosphine | (noun) a colorless gas with a strong fishy smell; used as a pesticide | - |
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| phosphocreatine | (noun) an organic compound of creatine and phosphoric acid; found in the muscles of vertebrates where its hydrolysis releases energy for muscular contraction | Synonyms: creatine phosphate, creatine phosphoric acid |
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| phospholipid | (noun) any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes | - |
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| phosphoprotein | (noun) containing chemically bound phosphoric acid | - |
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| phosphor | (noun) a synthetic substance that is fluorescent or phosphorescent; used to coat the screens of cathode ray tubes | - |
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| phosphorescence | (noun) a fluorescence that persists after the bombarding radiation has ceased | - |
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| phosphorus | (noun) a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms | Synonyms: atomic number 15, P |
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| polyphosphate | (noun) a salt or ester of polyphosphoric acid | - |
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| pothos | (noun) any of various tropical lianas of the genus Scindapsus | - |
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| (noun) evergreen liana widely cultivated for its variegated foliage | Synonyms: Epipremnum aureum, golden pothos, ivy arum, Scindapsus aureus |
| psychosexuality | (noun) the mental representation of sexual activities | - |
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| psychosis | (noun) any severe mental disorder in which contact with reality is lost or highly distorted | - |
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| psychosurgery | (noun) brain surgery on human patients intended to relieve severe and otherwise intractable mental or behavioral problems | - |
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| pyrophosphate | (noun) a salt or ester of pyrophosphoric acid | - |
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| sporotrichosis | (noun) a chronic fungal infection of the skin and lymph nodes | - |
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| stethoscope | (noun) a medical instrument for listening to the sounds generated inside the body | - |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| xanthosis | (noun) an abnormal yellow discoloration of the skin | - |
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