| acetophenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetphenetidin, phenacetin |
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| atopognosia | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosis |
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| atopognosis | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosia |
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| atopy | (noun) an allergic reaction that becomes apparent in a sensitized person only minutes after contact | Synonyms: atopic allergy, immediate allergy, type I allergic reaction |
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| autophyte | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophytic plant, autotroph, autotrophic organism |
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| autopilot | (noun) a navigational device that automatically keeps ships or planes or spacecraft on a steady course | Synonyms: automatic pilot, robot pilot |
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| (noun) a cognitive state in which you act without self-awareness | Synonyms: automatic pilot |
| autoplasty | (noun) surgical repair by using tissue from another part of the patient's own body | - |
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| (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autograft |
| autopsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: necropsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| backstop | (noun) a precaution in case of an emergency | - |
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| (noun) (baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field | - |
| (noun) (baseball) the person who plays the position of catcher | Synonyms: catcher |
| blacktop | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktopping |
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| blacktopping | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktop |
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| blastopore | (noun) the opening into the archenteron | - |
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| captopril | (noun) a drug (trade name Capoten) that blocks the formation of angiotensin in the kidneys resulting in vasodilation; used in the treatment of hypertension and congestive heart failure | Synonyms: Capoten |
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| carrottop | (noun) someone who has red hair | Synonyms: red-header, redhead, redheader |
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| catoptrics | (noun) branch of optics dealing with formation of images by mirrors | - |
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| ceratopsian | (noun) any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia | Synonyms: horned dinosaur |
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| chloroacetophenone | (noun) a tear gas that is weaker than CS gas but lasts longer | Synonyms: CN gas |
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| countertop | (noun) the top side of a counter | - |
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| cryptophyte | (noun) common in fresh and salt water appearing along the shore as algal blooms | Synonyms: cryptomonad |
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| cystoparalysis | (noun) paralysis of the urinary bladder | Synonyms: cystoplegia |
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| cystoplegia | (noun) paralysis of the urinary bladder | Synonyms: cystoparalysis |
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| cytopenia | (noun) a deficiency of some cellular element of the blood | - |
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| cytophotometer | (noun) a photometer that can be used to locate and identify chemical compounds in a cell by measuring the intensity of the light that passes through stained sections of the cytoplasm | - |
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| cytophotometry | (noun) the study of chemical compounds inside a cell by means of a cytophotometer | - |
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| cytoplasm | (noun) the protoplasm of a cell excluding the nucleus; is full of proteins that control cell metabolism | Synonyms: cytol |
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| cytoplast | (noun) the intact cytoplasmic content of a cell | - |
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| dermatophytosis | (noun) fungal infection of the skin (especially of moist parts covered by clothing) | Synonyms: dermatomycosis |
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| desktop | (noun) (computer science) the area of the screen in graphical user interfaces against which icons and windows appear | Synonyms: background, screen background |
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| (noun) the top of a desk | - |
| dichromatopsia | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromacy, dichromasy, dichromatism, dichromia |
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| doorstop | (noun) a stop that keeps open doors from moving | Synonyms: doorstopper |
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| doorstopper | (noun) a stop that keeps open doors from moving | Synonyms: doorstop |
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| dystopia | (noun) a work of fiction describing an imaginary place where life is extremely bad because of deprivation or oppression or terror | - |
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| (noun) state in which the conditions of life are extremely bad as from deprivation or oppression or terror | - |
| ectoparasite | (noun) any external parasitic organism (as fleas) | Synonyms: ectozoan, ectozoon, epizoan, epizoon |
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| ectopia | (noun) abnormal position of a part or organ (especially at the time of birth) | - |
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| ectoplasm | (noun) the outer granule-free layer of cytoplasm | - |
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| (noun) (spiritualism) a substance supposed to emanate from the body of the medium during a trance | - |
| ectoproct | (noun) sessile mossy aquatic animal having the anus of the polyp outside the crown of tentacles | - |
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| entoparasite | (noun) any of various parasites that live in the internal organs of animals (especially intestinal worms) | Synonyms: endoparasite, endozoan, entozoan, entozoon |
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| entoproct | (noun) any of various moss-like aquatic animals usually forming branching colonies; each polyp having a both mouth and anus within a closed ring of tentacles | - |
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| epikeratophakia | (noun) using a piece of donated corneal tissue to repair the eye of someone who has had a cataract removed | - |
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| epitope | (noun) the site on the surface of an antigen molecule to which an antibody attaches itself | Synonyms: antigenic determinant, determinant |
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| estoppel | (noun) a rule of evidence whereby a person is barred from denying the truth of a fact that has already been settled | - |
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| feathertop | (noun) northeastern tropical African plant having feathery panicles | Synonyms: feathertop grass, Pennistum villosum |
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| (noun) a variety of reed grass | Synonyms: Calamagrostis acutiflora, feather reed grass |
| fetoprotein | (noun) any of several antigens that occur naturally in the fetus and sometimes in adults with cancer | Synonyms: foetoprotein |
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| flattop | (noun) a large warship that carries planes and has a long flat deck for takeoffs and landings | Synonyms: aircraft carrier, attack aircraft carrier, carrier |
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| (noun) a closely cropped haircut; usually for men or boys | Synonyms: butch, crew cut |
| foetoprotein | (noun) any of several antigens that occur naturally in the fetus and sometimes in adults with cancer | Synonyms: fetoprotein |
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| foretop | (noun) a lock of a horse's mane that grows forward between the ears | Synonyms: forelock |
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| (noun) a platform at the head of a foremast | - |
| gametophore | (noun) a modified branch bearing gametangia as in the thalloid liverworts | - |
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| gametophyte | (noun) the gamete-bearing individual or phase in the life cycle of a plant having alternation of generations | - |
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| granulocytopenia | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulocytosis, agranulosis |
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| haematocytopenia | (noun) an abnormally low number of red blood cells in the blood | Synonyms: hematocytopenia |
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| haematopoiesis | (noun) the formation of blood cells in the living body (especially in the bone marrow) | Synonyms: haematogenesis, haemogenesis, haemopoiesis, hematogenesis, hematopoiesis, hemogenesis, hemopoiesis, sanguification |
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| hardtop | (noun) a car that resembles a convertible but has a fixed rigid top | - |
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| hematocytopenia | (noun) an abnormally low number of red blood cells in the blood | Synonyms: haematocytopenia |
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| hematopoiesis | (noun) the formation of blood cells in the living body (especially in the bone marrow) | Synonyms: haematogenesis, haematopoiesis, haemogenesis, haemopoiesis, hematogenesis, hemogenesis, hemopoiesis, sanguification |
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| hilltop | (noun) the peak of a hill | Synonyms: brow |
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| housetop | (noun) the roof of a house | - |
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| iontophoresis | (noun) therapy that uses a local electric current to introduce the ions of a medicine into the tissues | Synonyms: electromotive drug administration, EMDA, ionic medication, iontotherapy |
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| isotope | (noun) one of two or more atoms with the same atomic number but with different numbers of neutrons | - |
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| keratoplasty | (noun) a surgical procedure in which part or all of a damaged or diseased cornea is replaced by healthy corneal tissue from a donor | Synonyms: corneal graft, corneal transplant |
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| ketoprofen | (noun) nonsteroidal anti-inflammatory drug (trade names Orudis or Orudis KT or Oruvail) | Synonyms: Orudis, Orudis KT, Oruvail |
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| laptop | (noun) a portable computer small enough to use in your lap | Synonyms: laptop computer |
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| lymphocytopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphopenia |
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| mastopathy | (noun) any pathology of the breast | Synonyms: mazopathy |
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| mastopexy | (noun) plastic surgery to lift or reshape the breasts | - |
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| megagametophyte | (noun) the female gametophyte produced by the megaspore of a plant that produces both microspore and megaspores | - |
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| mercaptopurine | (noun) a drug (trade name Purinethol) that interferes with the metabolism of purine and is used to treat acute lymphocytic leukemia | Synonyms: Purinethol |
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| metopion | (noun) the craniometric point midway between the frontal eminences of the skull | - |
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| metoprolol | (noun) beta blocker (trade name Lopressor) used in treating hypertension and angina and arrhythmia and acute myocardial infarction; has adverse side effects (depression and exacerbation of congestive heart failure etc.) | Synonyms: Lopressor |
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| microgametophyte | (noun) the male gametophyte produced by a microspore | - |
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| microtoponym | (noun) a name of a "minor" or small natural feature (e.g., a field, path, bridge, ditch, etc.). | - |
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| monotopism | (noun) origin of a systematic group only once (as by mutation) or at a single location. | - |
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| nonstop | (noun) a flight made without intermediate stops between source and destination | Synonyms: nonstop flight |
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| nyctophobia | (noun) a morbid fear of night or darkness | - |
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| octopod | (noun) a cephalopod with eight arms but lacking an internal shell | - |
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| octopus | (noun) bottom-living cephalopod having a soft oval body with eight long tentacles | Synonyms: devilfish |
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| (noun) tentacles of octopus prepared as food | - |
| onomatopoeia | (noun) using words that imitate the sound they denote | - |
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| otoplasty | (noun) reconstructive surgery of the auricle of the external ear | - |
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| palatopharyngoplasty | (noun) surgical resection of unnecessary palatal and oropharyngeal tissue to open the airway; intended to cure extreme cases of snoring (with or without sleep apnea) | Synonyms: PPP, UPPP, uvulopalatopharyngoplasty |
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| pancytopenia | (noun) an abnormal deficiency in all blood cells (red blood cells and white blood cells and platelets); usually associated with bone marrow tumor or with aplastic anemia | - |
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| photophobia | (noun) pain in the eye resulting from exposure to bright light (often associated with albinism) | Synonyms: photalgia |
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| (noun) a morbid fear of light | - |
| photopigment | (noun) a special pigment found in the rods and cones of the retina | - |
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| phytoplankton | (noun) photosynthetic or plant constituent of plankton; mainly unicellular algae | - |
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| pneumatophore | (noun) an air-filled root (submerged or exposed) that can function as a respiratory organ of a marsh or swamp plant | - |
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| proctoplasty | (noun) reconstructive surgery of the anus or rectum | Synonyms: rectoplasty |
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| protoceratops | (noun) small horned dinosaur | - |
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| protoplasm | (noun) the substance of a living cell (including cytoplasm and nucleus) | Synonyms: living substance |
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| protoplast | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: energid |
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| radioisotope | (noun) a radioactive isotope of an element; produced either naturally or artificially | - |
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| rectoplasty | (noun) reconstructive surgery of the anus or rectum | Synonyms: proctoplasty |
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| rooftop | (noun) the top of a (usually flat) roof | - |
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| scatophagy | (noun) the eating of excrement or other filth | - |
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| screwtop | (noun) the top of a container that must be screwed off and on | - |
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| shortstop | (noun) the fielding position of the player on a baseball team who is stationed between second and third base | Synonyms: short |
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| (noun) (baseball) the person who plays the shortstop position | - |
| showstopper | (noun) something that is strikingly attractive or has great popular appeal | Synonyms: show-stopper |
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| (noun) an act so striking or impressive that the show must be delayed until the audience quiets down | Synonyms: show-stopper, stopper |
| spermatophyte | (noun) plant that reproduces by means of seeds not spores | Synonyms: phanerogam, seed plant |
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| steatopygia | (noun) an extreme accumulation of fat on the buttocks | - |
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| stomatopod | (noun) a kind of crustacean | Synonyms: stomatopod crustacean |
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| stop | (noun) the act of stopping something | Synonyms: stoppage |
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| (noun) a brief stay in the course of a journey | Synonyms: layover, stopover |
| (noun) a restraint that checks the motion of something | Synonyms: catch |
| (noun) an obstruction in a pipe or tube | Synonyms: block, blockage, closure, occlusion, stoppage |
| (noun) a mechanical device in a camera that controls size of aperture of the lens | Synonyms: diaphragm |
| (noun) (music) a knob on an organ that is pulled to change the sound quality from the organ pipes | - |
| (noun) a consonant produced by stopping the flow of air at some point and suddenly releasing it | Synonyms: occlusive, plosive, plosive consonant, plosive speech sound, stop consonant |
| (noun) a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations | Synonyms: full point, full stop, period, point |
| (noun) the event of something ending | Synonyms: halt |
| (noun) a spot where something halts or pauses | - |
| (noun) the state of inactivity following an interruption | Synonyms: arrest, check, halt, hitch, stay, stoppage |
| stopcock | (noun) faucet consisting of a rotating device for regulating flow of a liquid | Synonyms: cock, turncock |
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| stopgap | (noun) something contrived to meet an urgent need or emergency | Synonyms: make-do, makeshift |
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