| ablepharia | (noun) a congenital absence of eyelids (partial or complete) | - |
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| acanthocephalan | (noun) any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines | Synonyms: spiny-headed worm |
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| acceptability | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptableness |
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| acceptableness | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptability |
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| acceptance | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptation, adoption, espousal |
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| (noun) the act of taking something that is offered | - |
| (noun) a disposition to tolerate or accept people or situations | Synonyms: sufferance, toleration |
| (noun) the mental attitude that something is believable and should be accepted as true | Synonyms: credence |
| (noun) (contract law) words signifying consent to the terms of an offer (thereby creating a contract) | - |
| (noun) a time draft drawn on and accepted by a bank | Synonyms: banker's acceptance |
| (noun) the state of being acceptable and accepted | - |
| acceptation | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptance, adoption, espousal |
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| (noun) the accepted meaning of a word | Synonyms: word meaning, word sense |
| (noun) acceptance as true or valid | - |
| acceptor | (noun) the person (or institution) who accepts a check or draft and becomes responsible for paying the party named in the draft when it matures | - |
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| (noun) (chemistry) in the formation of a coordinate bond it is the compound to which electrons are donated | - |
| acephalia | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalism, acephaly |
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| acephalism | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephaly |
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| acephaly | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephalism |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| adept | (noun) someone who is dazzlingly skilled in any field | Synonyms: ace, champion, genius, hotshot, maven, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard |
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| adeptness | (noun) skillful performance or ability without difficulty | Synonyms: adroitness, deftness, facility, quickness |
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| aepyornis | (noun) huge (to 9 ft.) extinct flightless bird of Madagascar | Synonyms: elephant bird |
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| aleph | (noun) the 1st letter of the Hebrew alphabet | - |
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| amboceptor | (noun) an immune body formed in the blood during infection or immunization that serves to link the complement to the antigen. | - |
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| analeptic | (noun) a medication used as a stimulant to the central nervous system | - |
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| anencephalia | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephaly |
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| anencephaly | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephalia |
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| antepenult | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenultima, antepenultimate |
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| antepenultima | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultimate |
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| antepenultimate | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultima |
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| antidepressant | (noun) any of a class of drugs used to treat depression; often have undesirable side effects | Synonyms: antidepressant drug |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antilepton | (noun) the antiparticle of a lepton | - |
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| antiredeposition | (noun) the process of preventing redeposition | - |
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| antisepsis | (noun) the process of inhibiting the growth and multiplication of microorganisms | Synonyms: asepsis |
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| (noun) (of non-living objects) the state of being free of pathogenic organisms | Synonyms: asepsis, sterileness, sterility |
| antiseptic | (noun) a substance that destroys micro-organisms that carry disease without harming body tissues | - |
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| apperception | (noun) the process whereby perceived qualities of an object are related to past experience | - |
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| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| asepsis | (noun) the process of inhibiting the growth and multiplication of microorganisms | Synonyms: antisepsis |
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| (noun) (of non-living objects) the state of being free of pathogenic organisms | Synonyms: antisepsis, sterileness, sterility |
| barkeep | (noun) an employee who mixes and serves alcoholic drinks at a bar | Synonyms: barkeeper, bartender, mixologist |
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| barkeeper | (noun) an employee who mixes and serves alcoholic drinks at a bar | Synonyms: barkeep, bartender, mixologist |
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| baroreceptor | (noun) a sensory receptor that responds to pressure | - |
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| beekeeper | (noun) a farmer who keeps bees for their honey | Synonyms: apiarist, apiculturist |
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| beekeeping | (noun) the cultivation of bees on a commercial scale for the production of honey | Synonyms: apiculture |
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| beep | (noun) a short high tone produced as a signal or warning | Synonyms: bleep |
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| beeper | (noun) an electronic device that generates a series of beeps when the person carrying it is being paged | Synonyms: pager |
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| benzodiazepine | (noun) any of several similar lipophilic amines used as tranquilizers or sedatives or hypnotics or muscle relaxants; chronic use can lead to dependency | - |
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| biceps | (noun) any skeletal muscle having two origins (but especially the muscle that flexes the forearm) | - |
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| biteplate | (noun) a removable dental appliance that is worn in the palate for diagnostic or therapeutic purposes | Synonyms: bite plate |
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| bleep | (noun) a short high tone produced as a signal or warning | Synonyms: beep |
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| blepharism | (noun) condition in which a person blinks continuously | - |
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| blepharitis | (noun) inflammation of the eyelids characterized by redness and swelling and dried crusts | - |
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| blepharospasm | (noun) spasm of the eyelid muscle resulting in closure of the eye | - |
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| bluepoint | (noun) small edible oyster typically from the southern shore of Long Island | Synonyms: blue point |
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| (noun) oysters originally from Long Island Sound but now from anywhere along the northeastern seacoast; usually eaten raw | Synonyms: blue point |
| blueprint | (noun) photographic print of plans or technical drawings etc. | - |
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| (noun) something intended as a guide for making something else | Synonyms: design, pattern |
| bookkeeper | (noun) someone who records the transactions of a business | - |
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| bookkeeping | (noun) the activity of recording business transactions | Synonyms: clerking |
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| bopeep | (noun) a game played with young children; you hide your face and suddenly reveal it as you say boo! | Synonyms: peekaboo |
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| brachycephalic | (noun) an adult with a short broad head | - |
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| brachycephalism | (noun) the quality of being brachycephalic | Synonyms: brachycephaly |
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| brachycephaly | (noun) the quality of being brachycephalic | Synonyms: brachycephalism |
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| candlepin | (noun) a bowling pin that is thin by comparison with a tenpin | - |
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| candlepins | (noun) a bowling game using slender bowling pins | Synonyms: candlepin bowling |
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| candlepower | (noun) luminous intensity measured in candelas | Synonyms: light intensity |
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| cassareep | (noun) a flavoring made by boiling down the juice of the bitter cassava; used in West Indian cooking | - |
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| catalepsy | (noun) a trancelike state with loss of voluntary motion and failure to react to stimuli | - |
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| cataleptic | (noun) a person suffering from catalepsy | - |
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| centrepiece | (noun) something placed at the center of something else (as on a table) | Synonyms: centerpiece |
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| (noun) the central or most important feature | Synonyms: centerpiece |
| cephalalgia | (noun) pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs | Synonyms: head ache, headache |
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| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| cephalexin | (noun) a cephalosporin antibiotic (trade names Keflex and Keflin and Keftab) commonly prescribed for mild to moderately severe infections of the skin or ears or throat or lungs or urinary tract | Synonyms: Keflex, Keflin, Keftab |
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| cephalhematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalohematoma |
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| cephalitis | (noun) inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use) | Synonyms: encephalitis, phrenitis |
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| cephalochordate | (noun) fish-like animals having a notochord rather than a true spinal column | - |
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| cephaloglycin | (noun) antibiotic related to cephalosporin but no longer in common use | Synonyms: Kafocin |
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| cephalohematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalhematoma |
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| cephalometry | (noun) measurement of human heads | - |
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| cephalopod | (noun) marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles | Synonyms: cephalopod mollusk |
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| cephaloridine | (noun) a broad spectrum semisynthetic antibiotic produced by modifying cephalosporin | - |
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| cephalosporin | (noun) one of several broad spectrum antibiotic substances obtained from fungi and related to penicillin (trade names Mefoxin); addition of side chains has produced semisynthetic antibiotics with greater antibacterial activity | Synonyms: Mefoxin |
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| cephalothin | (noun) a semisynthetic analogue of cephalosporin | - |
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| cheep | (noun) the short weak cry of a young bird | Synonyms: peep |
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| chemoreceptor | (noun) a sensory receptor that responds to chemical stimuli | - |
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| chimneysweep | (noun) someone who cleans soot from chimneys | Synonyms: chimneysweeper, sweep |
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| chimneysweeper | (noun) someone who cleans soot from chimneys | Synonyms: chimneysweep, sweep |
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| chlordiazepoxide | (noun) a tranquilizer (trade names Librium and Libritabs) used in the treatment of alcoholism | Synonyms: Libritabs, Librium |
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| chokepoint | (noun) a point of congestion or blockage | - |
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| (noun) a narrowing that reduces the flow through a channel | Synonyms: bottleneck, constriction |
| clepsydra | (noun) clock that measures time by the escape of water | Synonyms: water clock, water glass |
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| clinocephalism | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephaly |
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| clinocephaly | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephalism |
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| coffeepot | (noun) tall pot in which coffee is brewed | - |
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| concept | (noun) an abstract or general idea inferred or derived from specific instances | Synonyms: conception, construct |
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| conception | (noun) the act of becoming pregnant; fertilization of an ovum by a spermatozoon | - |
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| (noun) an abstract or general idea inferred or derived from specific instances | Synonyms: concept, construct |
| (noun) the creation of something in the mind | Synonyms: design, excogitation, innovation, invention |
| (noun) the event that occurred at the beginning of something | Synonyms: creation |
| conceptualisation | (noun) inventing or contriving an idea or explanation and formulating it mentally | Synonyms: conceptualization, formulation |
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| (noun) an elaborated concept | Synonyms: conceptuality, conceptualization |
| conceptualism | (noun) the doctrine that the application of a general term to various objects indicates the existence of a mental entity that mediates the application | - |
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| conceptuality | (noun) an elaborated concept | Synonyms: conceptualisation, conceptualization |
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| conceptualization | (noun) inventing or contriving an idea or explanation and formulating it mentally | Synonyms: conceptualisation, formulation |
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| (noun) an elaborated concept | Synonyms: conceptualisation, conceptuality |
| conceptus | (noun) an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life | Synonyms: embryo, fertilized egg |
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| contraception | (noun) birth control by the use of devices (diaphragm or intrauterine device or condom) or drugs or surgery | Synonyms: contraceptive method |
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| contraceptive | (noun) an agent or device intended to prevent conception | Synonyms: birth control device, contraceptive device, preventative, preventive, prophylactic device |
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| copepod | (noun) minute marine or freshwater crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish | Synonyms: copepod crustacean |
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| corbiestep | (noun) (architecture) a step on the top of a gable wall | Synonyms: corbel step, corbie-step, crow step |
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| creep | (noun) a slow mode of locomotion on hands and knees or dragging the body | Synonyms: crawl, crawling, creeping |
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| (noun) a pen that is fenced so that young animals can enter but adults cannot | - |
| (noun) a slow longitudinal movement or deformation | - |
| (noun) someone unpleasantly strange or eccentric | Synonyms: spook, weirdie, weirdo, weirdy |
| creeper | (noun) any of various small insectivorous birds of the Northern Hemisphere that climb up a tree trunk supporting themselves on stiff tail feathers and their feet | Synonyms: tree creeper |
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| (noun) a person who crawls or creeps along the ground | Synonyms: crawler |
| (noun) any plant (as ivy or periwinkle) that grows by creeping | - |
| creepiness | (noun) an uneasy sensation as of insects creeping on your skin | - |
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| creeping | (noun) a slow mode of locomotion on hands and knees or dragging the body | Synonyms: crawl, crawling, creep |
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| creeps | (noun) a feeling of fear and revulsion | - |
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| (noun) a disease of cattle and sheep attributed to a dietary deficiency; characterized by anemia and softening of the bones and a slow stiff gait | - |
| crepe | (noun) a soft thin light fabric with a crinkled surface | Synonyms: crape |
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| (noun) small very thin pancake | Synonyms: crape, French pancake |
| (noun) paper with a crinkled texture; usually colored and used for decorations | Synonyms: crepe paper |