| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| amberfish | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberjack |
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| anglerfish | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: allmouth, angler, angler fish, goosefish, Lophius Americanus, lotte, monkfish |
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| archerfish | (noun) any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia | Synonyms: Toxotes jaculatrix |
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| buckminsterfullerene | (noun) a spheroidal fullerene; the first known example of a fullerene | Synonyms: buckyball |
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| butterfat | (noun) the fatty substance of milk from which butter is made | - |
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| butterfingers | (noun) someone who drops things (especially one who cannot catch a ball) | - |
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| butterfish | (noun) small marine fish with a short compressed body and feeble spines | Synonyms: stromateid, stromateid fish |
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| (noun) slippery scaleless food fish of the northern Atlantic coastal waters | Synonyms: Pholis gunnellus, rock gunnel |
| (noun) any of numerous small flat Atlantic food fish having smooth skin | - |
| butterflower | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, crowfoot, goldcup, kingcup |
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| butterfly | (noun) a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down | Synonyms: butterfly stroke |
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| (noun) diurnal insect typically having a slender body with knobbed antennae and broad colorful wings | - |
| butterflyfish | (noun) tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins | Synonyms: flying gurnard, flying robin |
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| centerfield | (noun) the fielding position of the player on a baseball team who is expected to field balls in the central third of the outfield | Synonyms: center field |
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| (noun) the piece of ground in the outfield directly ahead of the catcher | Synonyms: center, center field, centre |
| centerfielder | (noun) the person who plays center field | Synonyms: center fielder |
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| centerfold | (noun) a magazine center spread; especially a foldout of a large photograph or map or other feature | Synonyms: centrefold |
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| cheerfulness | (noun) the quality of being cheerful and dispelling gloom | Synonyms: cheer, sunniness, sunshine |
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| (noun) a feeling of spontaneous good spirits | Synonyms: blitheness |
| chesterfield | (noun) a fitted overcoat with a velvet collar | - |
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| (noun) an overstuffed davenport with upright armrests | - |
| chiggerflower | (noun) erect perennial of eastern and southern United States having showy orange flowers | Synonyms: Asclepias tuberosa, butterfly weed, chigger flower, Indian paintbrush, orange milkweed, pleurisy root, tuber root |
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| clusterfuck | (noun) A chaotic situation where everything seems to go wrong | - |
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| containerful | (noun) the quantity that a container will hold | - |
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| counterfactuality | (noun) the quality of being contrary to fact | - |
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| counterfeit | (noun) a copy that is represented as the original | Synonyms: forgery |
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| counterfeiter | (noun) someone who makes copies illegally | Synonyms: forger |
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| counterfire | (noun) fire intended to neutralize or destroy enemy weapons | - |
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| counterfoil | (noun) the part of a check that is retained as a record | Synonyms: check stub, stub |
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| featherfoil | (noun) a plant of the genus Hottonia | Synonyms: feather-foil |
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| feverfew | (noun) bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum parthenium, Tanacetum parthenium |
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| fingerflower | (noun) tall leafy European biennial or perennial having spectacular clusters of large tubular pink-purple flowers; leaves yield drug digitalis and are poisonous to livestock | Synonyms: common foxglove, Digitalis purpurea, fairy bell, finger-flower, finger-root, fingerroot |
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| gerfalcon | (noun) large and rare Arctic falcon having white and dark color phases | Synonyms: Falco rusticolus, gyrfalcon |
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| imperfect | (noun) a tense of verbs used in describing action that is on-going | Synonyms: continuous tense, imperfect tense, progressive, progressive tense |
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| imperfectibility | (noun) the capability of becoming imperfect | - |
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| imperfection | (noun) the state or an instance of being imperfect | Synonyms: imperfectness |
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| imperfective | (noun) aspect without regard to the beginning or completion of the action of the verb | Synonyms: imperfective aspect |
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| imperfectness | (noun) the state or an instance of being imperfect | Synonyms: imperfection |
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| interface | (noun) (chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases) | - |
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| (noun) (computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals) | Synonyms: port |
| (noun) the overlap where two theories or phenomena affect each other or have links with each other | - |
| (noun) (computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system | Synonyms: user interface |
| interference | (noun) the act of hindering or obstructing or impeding | Synonyms: hinderance, hindrance |
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| (noun) (American football) blocking a player's path with your body | - |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, preventative, preventive |
| (noun) a policy of intervening in the affairs of other countries | Synonyms: intervention |
| (noun) electrical or acoustic activity that can disturb communication | Synonyms: disturbance, noise |
| interferometer | (noun) any measuring instrument that uses interference patterns to make accurate measurements of waves | - |
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| interferon | (noun) an antiviral protein produced by cells that have been invaded by a virus; inhibits replication of the virus | - |
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| interfixation | (noun) derivation of a new word by inserting an interfix between two morphemes. | - |
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| kerfuffle | (noun) a disorderly outburst or tumult | Synonyms: commotion, disruption, disturbance, flutter, hoo-ha, hoo-hah, hurly burly, to-do |
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| leatherfish | (noun) any of several brightly colored tropical filefishes | Synonyms: leatherjacket |
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| materfamilias | (noun) a female head of a family or tribe | Synonyms: matriarch |
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| motherfucker | (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, bastard, cocksucker, dickhead, mother fucker, prick, shit, SOB, son of a bitch, whoreson |
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| noninterference | (noun) a foreign policy of staying out of other countries' disputes | Synonyms: nonintervention |
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| nonperformance | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, neglect, negligence |
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| overfamiliarity | (noun) The state of being common or repeated to the point of being unnoticed or annoying. | - |
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| overfeeding | (noun) excessive feeding | - |
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| overflight | (noun) a flight by an aircraft over a particular area (especially over an area in foreign territory) | - |
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| overflow | (noun) a large flow | Synonyms: flood, outpouring |
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| (noun) the occurrence of surplus liquid (as water) exceeding the limit or capacity | Synonyms: overspill, runoff |
| oysterfish | (noun) a variety of toadfish | Synonyms: oyster-fish, oyster fish |
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| paterfamilias | (noun) the male head of family or tribe | Synonyms: patriarch |
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| perfect | (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect tense, perfective, perfective tense |
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| perfecta | (noun) a bet that you can pick the first and second finishers in the right order | Synonyms: exacta |
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| perfecter | (noun) a skilled worker who perfects something | - |
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| perfectibility | (noun) the capability of becoming perfect | - |
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| perfection | (noun) the act of making something perfect | - |
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| (noun) an ideal instance; a perfect embodiment of a concept | Synonyms: beau ideal, idol, paragon |
| (noun) the state of being without a flaw or defect | Synonyms: flawlessness, ne plus ultra |
| perfectionism | (noun) a disposition to feel that anything less than perfect is unacceptable | - |
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| perfectionist | (noun) a person who is displeased by anything that does not meet very high standards | - |
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| perfective | (noun) the aspect of a verb that expresses a completed action | Synonyms: perfective aspect |
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| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect, perfect tense, perfective tense |
| perfidiousness | (noun) betrayal of a trust | Synonyms: perfidy, treachery |
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| perfidy | (noun) an act of deliberate betrayal | Synonyms: betrayal, treachery, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, treachery |
| perfluorocarbon | (noun) a powerful greenhouse gas emitted during the production of aluminum | Synonyms: PFC |
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| perforation | (noun) the act of punching a hole (especially a row of holes as for ease of separation) | - |
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| (noun) a line of small holes for tearing at a particular place | - |
| (noun) a hole made in something | - |
| performance | (noun) the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it | Synonyms: carrying into action, carrying out, execution |
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| (noun) the act of presenting a play or a piece of music or other entertainment | - |
| (noun) any recognized accomplishment | - |
| (noun) a dramatic or musical entertainment | Synonyms: public presentation |
| (noun) process or manner of functioning or operating | Synonyms: functioning, operation |
| performer | (noun) an entertainer who performs a dramatic or musical work for an audience | Synonyms: performing artist |
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| performing | (noun) the performance of a part or role in a drama | Synonyms: acting, playacting, playing |
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| perfume | (noun) a toiletry that emits and diffuses a fragrant odor | Synonyms: essence |
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| (noun) a distinctive odor that is pleasant | Synonyms: aroma, fragrance, scent |
| perfumer | (noun) a person who makes (and sells) perfumes | - |
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| perfumery | (noun) the art of making perfumes | - |
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| (noun) an establishment where perfumes are made | - |
| (noun) store where perfumes are sold | - |
| (noun) perfumes in general | - |
| perfusion | (noun) pumping a liquid into an organ or tissue (especially by way of blood vessels) | - |
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| pitcherful | (noun) the quantity contained in a pitcher | Synonyms: pitcher |
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| pluperfect | (noun) a perfective tense used to express action completed in the past | Synonyms: past perfect, past perfect tense, pluperfect tense |
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| powerfulness | (noun) possession of controlling influence | Synonyms: power |
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| pufferfish | (noun) any of numerous marine fishes whose elongated spiny body can inflate itself with water or air to form a globe; several species contain a potent nerve poison; closely related to spiny puffers | Synonyms: blowfish, globefish, puffer |
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| (noun) delicacy that is highly dangerous because of a potent nerve poison in ovaries and liver | Synonyms: blowfish, puffer, sea squab |
| quarterfinal | (noun) one of the four competitions in an elimination tournament whose winners go on to play in the semifinals | - |
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| rudderfish | (noun) fish having the habit of following ships; found in North American and South American coastal waters | Synonyms: banded rudderfish, Seriola zonata |
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| (noun) food and game fish around Bermuda and Florida; often follow ships | Synonyms: Bermuda chub, Kyphosus sectatrix |
| rutherford | (noun) a unit strength of a radioactive source equal to one million disintegrations per second | - |
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| rutherfordium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, unnilquadium, Unq |
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| serf | (noun) (Middle Ages) a person who is bound to the land and owned by the feudal lord | Synonyms: helot, villein |
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| serfdom | (noun) the state of a serf | Synonyms: serfhood, vassalage |
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| serfhood | (noun) the state of a serf | Synonyms: serfdom, vassalage |
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| silverfish | (noun) a silvery variety of Carassius auratus | - |
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| (noun) silver-grey wingless insect found in houses feeding on book bindings and starched clothing | Synonyms: Lepisma saccharina |
| soldierfish | (noun) the larger squirrelfishes | Synonyms: soldier-fish |
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| spiderflower | (noun) any of various often strong-smelling plants of the genus Cleome having showy spider-shaped flowers | Synonyms: cleome |
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| subterfuge | (noun) something intended to misrepresent the true nature of an activity | Synonyms: blind |
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| suckerfish | (noun) marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects | Synonyms: remora, sucking fish |
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| superfamily | (noun) (biology) a taxonomic group ranking below an order but above a family | - |
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| superfecta | (noun) a bet that you can pick the first four finishers in a race in the right order | - |
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| superfecundation | (noun) fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of coitus (especially by different males) | - |
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| superfetation | (noun) fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time | - |
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| superficiality | (noun) lack of depth of knowledge or thought or feeling | Synonyms: shallowness |
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| (noun) shallowness in terms of affecting only surface layers of something | - |
| superficies | (noun) outer surface of an area or a body | - |
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| (noun) the purely external aspect of a thing; superficial appearance | - |
| superfluity | (noun) extreme excess | Synonyms: embarrassment, overplus, plethora |
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| superfood | (noun) a food with health benefits | - |
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| tenderfoot | (noun) an inexperienced person (especially someone inexperienced in outdoor living) | - |
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| triggerfish | (noun) any of numerous compressed deep-bodied tropical fishes with sandpapery skin and erectile spines in the first dorsal fin | - |
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| uncheerfulness | (noun) not conducive to cheer or good spirits | - |
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| (noun) a feeling of dreary or pessimistic sadness | Synonyms: cheerlessness |
| underfelt | (noun) a carpet pad of thick felt | - |
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| underframe | (noun) the internal supporting structure that gives an artifact its shape | Synonyms: frame, skeletal frame, skeleton |
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| underfur | (noun) thick soft fur lying beneath the longer and coarser guard hair | Synonyms: undercoat |
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| underperformer | (noun) a business that is less successful than expected | - |
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| (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underachiever |