| abecedarian | (noun) a novice learning the rudiments of some subject | - |
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| abecedarius | (noun) a poem having lines beginning with letters of the alphabet in regular order | - |
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| ablepharia | (noun) a congenital absence of eyelids (partial or complete) | - |
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| aboriginal | (noun) an indigenous person who was born in a particular place | Synonyms: aborigine, indigen, indigene, native |
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| aborigine | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, indigen, indigene, native |
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| abridgement | (noun) a shortened version of a written work | Synonyms: abridgment, capsule, condensation |
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| abridger | (noun) one who shortens or abridges or condenses a written work | Synonyms: abbreviator |
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| abridgment | (noun) a shortened version of a written work | Synonyms: abridgement, capsule, condensation |
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| acariasis | (noun) infestation with itch mites | Synonyms: acaridiasis, acariosis |
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| acaricide | (noun) a chemical agent used to kill mites | Synonyms: acaracide |
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| acarid | (noun) very small free-living arachnid that is parasitic on animals or plants; related to ticks | - |
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| acaridiasis | (noun) infestation with itch mites | Synonyms: acariasis, acariosis |
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| acarine | (noun) mite or tick | - |
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| acariosis | (noun) infestation with itch mites | Synonyms: acariasis, acaridiasis |
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| acetonuria | (noun) excessive amounts of ketone bodies in the urine as in diabetes mellitus or starvation | Synonyms: ketoaciduria, ketonuria |
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| achlorhydria | (noun) an abnormal deficiency or absence of free hydrochloric acid in the gastric juice; often associated with severe anemias and cancer of the stomach | - |
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| achondrite | (noun) a stony meteor lacking chondrules | - |
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| acquiring | (noun) the act of acquiring something | Synonyms: getting |
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| acridid | (noun) grasshopper with short antennae | Synonyms: short-horned grasshopper |
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| acridity | (noun) extreme bitterness | Synonyms: acridness |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridness |
| (noun) having an acrid smell | - |
| acridness | (noun) extreme bitterness | Synonyms: acridity |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridity |
| acrimony | (noun) a rough and bitter manner | Synonyms: acerbity, bitterness, jaundice, tartness, thorniness |
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| acromicria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromikria |
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| acromikria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromicria |
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| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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| administrivia | (noun) the tiresome but essential details that must be taken care of and tasks that must be performed in running an organization | - |
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| adventurism | (noun) recklessness in politics or foreign affairs | - |
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| advertorial | (noun) an advertisement that is written and presented in the style of an editorial or journalistic report | - |
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| aerial | (noun) a pass to a receiver downfield from the passer | Synonyms: forward pass |
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| (noun) an electrical device that sends or receives radio or television signals | Synonyms: antenna, transmitting aerial |
| aerialist | (noun) an acrobat who performs in the air (as on a rope or trapeze) | - |
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| aerides | (noun) any orchid of the genus Aerides | - |
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| aerie | (noun) any habitation at a high altitude | Synonyms: aery, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aery, eyrie, eyry |
| affricate | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate consonant, affricative |
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| affrication | (noun) the conversion of a simple stop consonant into an affricate | - |
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| affricative | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate, affricate consonant |
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| affright | (noun) an overwhelming feeling of fear and anxiety | Synonyms: panic, terror |
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| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| afterimage | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: aftersensation |
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| agaric | (noun) a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside | - |
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| (noun) fungus used in the preparation of punk for fuses | Synonyms: Fomes igniarius |
| agribusiness | (noun) a large-scale farming enterprise | Synonyms: agriculture, factory farm |
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| agriculturalist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturist, cultivator, grower, raiser |
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| agriculture | (noun) the practice of cultivating the land or raising stock | Synonyms: farming, husbandry |
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| (noun) a large-scale farming enterprise | Synonyms: agribusiness, factory farm |
| (noun) the class of people engaged in growing food | - |
| agriculturist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturalist, cultivator, grower, raiser |
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| agrimonia | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimony |
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| agrimony | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimonia |
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| airiness | (noun) the property of something weightless and insubstantial | Synonyms: buoyancy |
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| (noun) the property of something spacious and abounding in fresh air | - |
| (noun) lightness in movement or manner | Synonyms: delicacy |
| airing | (noun) the act of supplying fresh air and getting rid of foul air | Synonyms: ventilation |
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| (noun) a short excursion (a walk or ride) in the open air | - |
| (noun) the opening of a subject to widespread discussion and debate | Synonyms: dissemination, public exposure, spreading |
| airstrip | (noun) an airfield without normal airport facilities | Synonyms: flight strip, landing strip, strip |
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| alacrity | (noun) liveliness and eagerness | Synonyms: briskness, smartness |
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| alastrim | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: Cuban itch, Kaffir pox, milk pox, pseudosmallpox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| albuminuria | (noun) the presence of excessive protein (chiefly albumin but also globulin) in the urine; usually a symptom of kidney disorder | Synonyms: proteinuria |
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| alcaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alkaptonuria |
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| aldotriose | (noun) Any aldose having three carbon atoms; in reality, just glyceraldehyde. | - |
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| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
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| alfilaria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfileria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| alfileria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| algorism | (noun) computation with Arabic figures | - |
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| (noun) the Arabic (or decimal) system of numeration | - |
| algorithm | (noun) a precise rule (or set of rules) specifying how to solve some problem | Synonyms: algorithmic program, algorithmic rule |
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| alizarin | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarine |
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| alizarine | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarin |
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| alkalinuria | (noun) a condition in which the urine (which is normally slightly acidic) is alkaline | Synonyms: alkaluria |
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| alkaluria | (noun) a condition in which the urine (which is normally slightly acidic) is alkaline | Synonyms: alkalinuria |
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| alkaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alcaptonuria |
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| allegoricalness | (noun) The state or quality of being allegorical. | - |
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| allegoriser | (noun) someone who communicates in allegories | Synonyms: allegorizer |
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| allegorizer | (noun) someone who communicates in allegories | Synonyms: allegoriser |
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| allomerism | (noun) (chemistry) variability in chemical composition without variation in crystalline form | - |
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| allopurinol | (noun) a drug (trade name Zyloprim) used to treat gout and other conditions in which there is an excessive buildup of uric acid | Synonyms: Zyloprim |
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| alphanumerics | (noun) a character set that includes letters and digits and punctuation | Synonyms: alphanumeric characters |
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| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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| altering | (noun) the sterilization of an animal | Synonyms: fixing, neutering |
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| amateurishness | (noun) something that demonstrates a lack of professional competency | - |
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| amateurism | (noun) the conviction that people should participate in sports as a hobby (for the fun of it) rather than for money | - |
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| ambergris | (noun) waxy substance secreted by the sperm whale and found floating at sea or washed ashore; used in perfume | - |
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| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| americium | (noun) a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms | Synonyms: Am, atomic number 95 |
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| amethopterin | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: methotrexate, methotrexate sodium |
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| ametria | (noun) congenital absence of the uterus | - |
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| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
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| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| aminopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: amidopyrine |
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| amitriptyline | (noun) a tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications | Synonyms: amitriptyline hydrochloride, Elavil |
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| ammoniuria | (noun) excessive ammonia in the urine | - |
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| amorist | (noun) one dedicated to love and lovemaking especially one who writes about love | - |
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| amphotericin | (noun) an antibiotic and antifungal agent | - |
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| amrinone | (noun) a drug (trade name Inocor) used intravenously in heart failure; increases strength of contraction of myocardium | Synonyms: Inocor |
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| anarthria | (noun) partial or total loss of articulate speech resulting from lesions of the central nervous system | - |
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| anchorite | (noun) one retired from society for religious reasons | Synonyms: hermit |
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| aneurin | (noun) a B vitamin that prevents beriberi; maintains appetite and growth | Synonyms: antiberiberi factor, thiamin, thiamine, vitamin B1 |
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| aneurism | (noun) a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall | Synonyms: aneurysm |
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| angiopteris | (noun) highly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall | Synonyms: Angiopteris evecta, giant fern |
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| angriness | (noun) the state of being angry | Synonyms: anger |
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| angularity | (noun) the property possessed by a shape that has angles | - |
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| (noun) a shape having one or more sharp angles | Synonyms: angular shape |
| anhydride | (noun) a compound formed from one or more other compounds in a reaction resulting in removal of water | - |
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| anterior | (noun) a tooth situated at the front of the mouth | Synonyms: front tooth |
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| anteriority | (noun) the quality of being in front or (in lower animals) toward the head | - |
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| (noun) preceding in time | Synonyms: antecedence, antecedency, precedence, precedency, priority |
| antheridiophore | (noun) gametophore bearing antheridia as in certain mosses and liverworts | - |
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| antheridium | (noun) the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers | - |
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| anthropocentricity | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentrism |
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