| marshland | (noun) low-lying wet land with grassy vegetation; usually is a transition zone between land and water | Synonyms: fen, fenland, marsh |
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| melancholia | (noun) extreme depression characterized by tearful sadness and irrational fears | - |
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| melancholiac | (noun) someone subject to melancholia | Synonyms: melancholic |
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| melancholic | (noun) someone subject to melancholia | Synonyms: melancholiac |
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| melancholy | (noun) a humor that was once believed to be secreted by the kidneys or spleen and to cause sadness and melancholy | Synonyms: black bile |
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| (noun) a feeling of thoughtful sadness | - |
| (noun) a constitutional tendency to be gloomy and depressed | - |
| melange | (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hodgepodge, hotchpotch, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
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| melanin | (noun) insoluble pigments that account for the color of e.g. skin and scales and feathers | - |
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| melanism | (noun) a condition characterized by abnormal deposits of melanin (especially in the skin) | Synonyms: melanosis |
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| melanoblast | (noun) an epidermal cell that is a precursor of a melanocyte | - |
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| melanocyte | (noun) a cell in the basal layer of the epidermis that produces melanin under the control of the melanocyte-stimulating hormone | - |
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| melanoderma | (noun) abnormally dark skin caused by increased deposits of melatonin | - |
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| melanoma | (noun) any of several malignant neoplasms (usually of the skin) consisting of melanocytes | Synonyms: malignant melanoma |
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| melanosis | (noun) a condition characterized by abnormal deposits of melanin (especially in the skin) | Synonyms: melanism |
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| melphalan | (noun) antineoplastic drug (trade name Alkeran) used to treat multiple myeloma and some other malignancies | Synonyms: Alkeran |
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| metalanguage | (noun) a language that can be used to describe languages | - |
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| microbalance | (noun) balance for weighing very small objects | - |
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| midland | (noun) the interior part of a country | - |
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| midplane | (noun) the median plane of the body (or some part of the body) | Synonyms: midline |
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| miscellanea | (noun) a collection containing a variety of sorts of things | Synonyms: assortment, miscellany, mixed bag, mixture, motley, potpourri, salmagundi, smorgasbord, variety |
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| miscellany | (noun) an anthology of short literary pieces and poems and ballads etc. | Synonyms: florilegium, garland |
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| (noun) a collection containing a variety of sorts of things | Synonyms: assortment, miscellanea, mixed bag, mixture, motley, potpourri, salmagundi, smorgasbord, variety |
| monoplane | (noun) an airplane with a single wing | - |
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| moorland | (noun) open land usually with peaty soil covered with heather and bracken and moss | Synonyms: moor |
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| motherland | (noun) the country where you were born | Synonyms: country of origin, fatherland, homeland, mother country, native land |
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| myrobalan | (noun) small Asiatic tree bearing edible red or yellow fruit | Synonyms: cherry plum, myrobalan plum, Prunus cerasifera |
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| nanoplankton | (noun) microscopic organisms found in plankton | - |
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| nonchalance | (noun) the trait of remaining calm and seeming not to care; a casual lack of concern | Synonyms: indifference, unconcern |
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| northland | (noun) any region lying in or toward the north | - |
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| ortolan | (noun) brownish Old World bunting often eaten as a delicacy | Synonyms: Emberiza hortulana, ortolan bunting |
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| outlander | (noun) a person who comes from a foreign country; someone who does not owe allegiance to your country | Synonyms: alien, foreigner, noncitizen |
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| outlandishness | (noun) strikingly out of the ordinary | Synonyms: bizarreness, weirdness |
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| palankeen | (noun) a closed litter carried on the shoulders of four bearers | Synonyms: palanquin |
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| palanquin | (noun) a closed litter carried on the shoulders of four bearers | Synonyms: palankeen |
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| paralanguage | (noun) the use of manner of speaking to communicate particular meanings | Synonyms: paralinguistic communication |
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| parkland | (noun) a large area of land preserved in its natural state as public property | Synonyms: park |
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| parlance | (noun) a manner of speaking that is natural to native speakers of a language | Synonyms: idiom |
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| pastureland | (noun) a field covered with grass or herbage and suitable for grazing by livestock | Synonyms: grazing land, lea, ley, pasture, pasture land |
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| peneplane | (noun) a more or less level land surface representing an advanced stage of erosion undisturbed by crustal movements | Synonyms: peneplain |
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| pentlandite | (noun) a mineral (iron and nickel sulphide) that is the chief ore of nickel | - |
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| petulance | (noun) an irritable petulant feeling | Synonyms: choler, crossness, fretfulness, fussiness, irritability, peevishness |
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| phalanger | (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: opossum, possum |
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| phalangist | (noun) a Spanish member of General Franco's political party | Synonyms: falangist |
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| phalangitis | (noun) inflammation of a finger or toe | - |
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| phalanx | (noun) any of the bones of the fingers or toes | - |
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| (noun) a body of troops in close array | - |
| (noun) any closely ranked crowd of people | - |
| phenylalanine | (noun) an essential amino acid found in proteins and needed for growth of children and for protein metabolism in children and adults; abundant in milk and eggs; it is normally converted to tyrosine in the human body | - |
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| philanderer | (noun) a man who likes many women and has short sexual relationships with them | Synonyms: womaniser, womanizer |
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| philanthropist | (noun) someone who makes charitable donations intended to increase human well-being | Synonyms: altruist |
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| philanthropy | (noun) voluntary promotion of human welfare | Synonyms: philanthropic gift |
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| phytoplankton | (noun) photosynthetic or plant constituent of plankton; mainly unicellular algae | - |
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| pieplant | (noun) long pinkish sour leafstalks usually eaten cooked and sweetened | Synonyms: rhubarb |
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| plan | (noun) scale drawing of a structure | Synonyms: architectural plan |
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| (noun) a series of steps to be carried out or goals to be accomplished | Synonyms: program, programme |
| (noun) an arrangement scheme | Synonyms: design |
| planaria | (noun) free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts | Synonyms: planarian |
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| planarian | (noun) free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts | Synonyms: planaria |
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| planation | (noun) the process of erosion whereby a level surface is produced | - |
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| planchet | (noun) a flat metal disk ready for stamping as a coin | Synonyms: coin blank |
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| planchette | (noun) a triangular board supported on casters; when lightly touched with the fingertips it is supposed to spell out supernatural (or unconscious) messages | - |
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| plane | (noun) a carpenter's hand tool with an adjustable blade for smoothing or shaping wood | Synonyms: carpenter's plane, woodworking plane |
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| (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: aeroplane, airplane |
| (noun) a power tool for smoothing or shaping wood | Synonyms: planer, planing machine |
| (noun) (mathematics) an unbounded two-dimensional shape | Synonyms: sheet |
| (noun) a level of existence or development | - |
| planeness | (noun) the property of having two dimensions | Synonyms: flatness, two-dimensionality |
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| planer | (noun) a power tool for smoothing or shaping wood | Synonyms: plane, planing machine |
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| planet | (noun) (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction | Synonyms: major planet |
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| (noun) any celestial body (other than comets or satellites) that revolves around a star | - |
| (noun) a person who follows or serves another | Synonyms: satellite |
| planetarium | (noun) an apparatus or model for representing the solar systems | - |
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| (noun) an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome | - |
| (noun) a building housing an instrument for projecting the positions of the planets onto a domed ceiling | - |
| planetesimal | (noun) one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system | - |
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| planetoid | (noun) any of numerous small celestial bodies that move around the sun | Synonyms: minor planet |
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| plangency | (noun) having the character of a loud deep sound; the quality of being resonant | Synonyms: resonance, reverberance, ringing, sonority, sonorousness, vibrancy |
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| planimeter | (noun) a measuring instrument for measuring the area of an irregular plane figure | Synonyms: integrator |
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| plank | (noun) an endorsed policy in the platform of a political party | - |
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| (noun) a stout length of sawn timber; made in a wide variety of sizes and used for many purposes | Synonyms: board |
| planking | (noun) the work of covering an area with planks | - |
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| (noun) (nautical) a covering or flooring constructed of planks (as on a ship) | - |
| (noun) planks collectively; a quantity of planks | - |
| plankton | (noun) the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water | - |
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| planner | (noun) a notebook for recording appointments and things to be done, etc. | - |
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| (noun) a person who makes plans | Synonyms: contriver, deviser |
| planning | (noun) an act of formulating a program for a definite course of action | - |
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| (noun) the act or process of drawing up plans or layouts for some project or enterprise | - |
| (noun) the cognitive process of thinking about what you will do in the event of something happening | Synonyms: preparation, provision |
| planography | (noun) the process of printing from a surface on which the printing areas are not raised but are ink-receptive (as opposed to ink repellent) | Synonyms: planographic printing |
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| plant | (noun) (botany) a living organism lacking the power of locomotion | Synonyms: flora, plant life |
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| (noun) buildings for carrying on industrial labor | Synonyms: industrial plant, works |
| (noun) something planted secretly for discovery by another | - |
| (noun) an actor situated in the audience whose acting is rehearsed but seems spontaneous to the audience | - |
| plantain | (noun) starchy banana-like fruit; eaten (always cooked) as a staple vegetable throughout the tropics | - |
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| (noun) a banana tree bearing hanging clusters of edible angular greenish starchy fruits; tropics and subtropics | Synonyms: Musa paradisiaca, plantain tree |
| (noun) any of numerous plants of the genus Plantago; mostly small roadside or dooryard weeds with elliptic leaves and small spikes of very small flowers; seeds of some used medicinally | - |
| plantation | (noun) garden consisting of a small cultivated wood without undergrowth | Synonyms: grove, orchard, woodlet |
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| (noun) an estate where cash crops are grown on a large scale (especially in tropical areas) | - |
| planter | (noun) a decorative pot for house plants | - |
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| (noun) the owner or manager of a plantation | Synonyms: plantation owner |
| (noun) a worker who puts or sets seeds or seedlings into the ground | - |
| planthopper | (noun) related to the leafhoppers and spittlebugs but rarely damages cultivated plants | Synonyms: plant hopper |
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| plantigrade | (noun) an animal that walks with the entire sole of the foot touching the ground as e.g. bears and human beings | Synonyms: plantigrade mammal |
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| planting | (noun) the act of fixing firmly in place | - |
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| (noun) putting seeds or young plants in the ground to grow | - |
| (noun) a collection of plants (trees or shrubs or flowers) in a particular area | - |
| plantlet | (noun) a young plant or a small plant | - |
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| plantsman | (noun) an expert in the science of cultivating plants (fruit or flowers or vegetables or ornamental plants) | Synonyms: horticulturist |
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| planula | (noun) the flat ciliated free-swimming larva of hydrozoan coelenterates | - |
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| ploughland | (noun) arable land that is worked by plowing and sowing and raising crops | Synonyms: cultivated land, farmland, plowland, tillage, tilled land, tilth |
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| plowland | (noun) arable land that is worked by plowing and sowing and raising crops | Synonyms: cultivated land, farmland, ploughland, tillage, tilled land, tilth |
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| postulant | (noun) one submitting a request or application especially one seeking admission into a religious order | - |
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| potamoplankton | (noun) plankton that inhabit rivers | - |
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| propellant | (noun) any substance that propels | Synonyms: propellent |
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| prostaglandin | (noun) a potent substance that acts like a hormone and is found in many bodily tissues (and especially in semen); produced in response to trauma and may affect blood pressure and metabolism and smooth muscle activity | - |
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| psilomelane | (noun) a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese | - |
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| purslane | (noun) a plant of the family Portulacaceae having fleshy succulent obovate leaves often grown as a potherb or salad herb; a weed in some areas | - |
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| pusillanimity | (noun) contemptible fearfulness | Synonyms: pusillanimousness |
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| pusillanimousness | (noun) contemptible fearfulness | Synonyms: pusillanimity |
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| raglan | (noun) a garment (coat or sweater) that has raglan sleeves | - |
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| rangeland | (noun) land suitable for grazing livestock | - |
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| rataplan | (noun) the sound made by beating a drum | Synonyms: drumbeat, rub-a-dub |
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| repellant | (noun) the power to repel | Synonyms: repellent |
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| (noun) a chemical substance that repels animals | Synonyms: repellent |
| (noun) a compound with which fabrics are treated to repel water | Synonyms: repellent |
| resemblance | (noun) similarity in appearance or external or superficial details | - |
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| sailplane | (noun) aircraft supported only by the dynamic action of air against its surfaces | Synonyms: glider |
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| sailplaning | (noun) the activity of flying a glider | Synonyms: glide, gliding, sailing, soaring |
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| scablands | (noun) (geology) flat elevated land with poor soil and little vegetation that is scarred by dry channels of glacial origin (especially in eastern Washington) | - |
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| screenland | (noun) the personnel of the film industry | Synonyms: filmdom, screen |
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| scrubland | (noun) an uncultivated region covered with scrub vegetation | - |
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