| watch | (noun) a purposeful surveillance to guard or observe | Synonyms: vigil |
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| (noun) the rite of staying awake for devotional purposes (especially on the eve of a religious festival) | Synonyms: vigil |
| (noun) a small portable timepiece | Synonyms: ticker |
| (noun) a person employed to keep watch for some anticipated event | Synonyms: lookout, lookout man, picket, scout, sentinel, sentry, spotter |
| (noun) a period of time (4 or 2 hours) during which some of a ship's crew are on duty | - |
| (noun) the period during which someone (especially a guard) is on duty | - |
| watchband | (noun) a band of cloth or leather or metal links attached to a wristwatch and wrapped around the wrist | Synonyms: bracelet, watch bracelet, watchstrap, wristband |
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| watchdog | (noun) a dog trained to guard property | Synonyms: guard dog |
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| (noun) a guardian or defender against theft or illegal practices or waste | - |
| watcher | (noun) a guard who keeps watch | Synonyms: security guard, watchman |
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| (noun) a close observer; someone who looks at something (such as an exhibition of some kind) | Synonyms: looker, spectator, viewer, witness |
| (noun) a person who keeps a devotional vigil by a sick bed or by a dead body | - |
| watchfulness | (noun) vigilant attentiveness | Synonyms: vigilance, weather eye |
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| (noun) the process of paying close and continuous attention | Synonyms: alertness, vigilance, wakefulness |
| watching | (noun) the act of observing; taking a patient look | Synonyms: observance, observation |
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| watchmaker | (noun) someone who makes or repairs watches | Synonyms: horologer, horologist |
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| watchman | (noun) a guard who keeps watch | Synonyms: security guard, watcher |
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| watchstrap | (noun) a band of cloth or leather or metal links attached to a wristwatch and wrapped around the wrist | Synonyms: bracelet, watch bracelet, watchband, wristband |
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| watchtower | (noun) an observation tower for a lookout to watch over prisoners or watch for fires or enemies | - |
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| watchword | (noun) a secret word or phrase known only to a restricted group | Synonyms: countersign, parole, password, word |
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| (noun) a slogan used to rally support for a cause | Synonyms: battle cry, cry, rallying cry, war cry |
| water | (noun) a facility that provides a source of water | Synonyms: water supply, water system |
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| (noun) a liquid necessary for the life of most animals and plants | - |
| (noun) the part of the earth's surface covered with water (such as a river or lake or ocean) | Synonyms: body of water |
| (noun) binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent | Synonyms: H2O |
| (noun) liquid excretory product | Synonyms: pee, piddle, piss, urine, weewee |
| (noun) once thought to be one of four elements composing the universe (Empedocles), associated with the humour phlegm | - |
| waterbird | (noun) freshwater aquatic bird | Synonyms: water bird, waterfowl |
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| waterboarding | (noun) torture where water is poured over the face of a captive simulating drowning | - |
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| waterbuck | (noun) any of several large African antelopes of the genus Kobus having curved ridged horns and frequenting e.g. swamps and rivers | - |
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| watercannon | (noun) a hose (carried on a truck) that fires water under high pressure to disperse crowds (especially crowds of rioters) | Synonyms: water cannon |
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| watercolor | (noun) the art or technique of painting with watercolors | Synonyms: water-color, water-colour, watercolour |
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| (noun) a painting produced with watercolors | Synonyms: water-color, water-colour, watercolour |
| (noun) a water-base paint (with water-soluble pigments); used by artists | Synonyms: water-color, water-colour, watercolour |
| (noun) water-soluble pigment | Synonyms: water-color, water-colour, watercolour |
| watercolorist | (noun) a painter who paints with watercolors | Synonyms: watercolourist |
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| watercolour | (noun) the art or technique of painting with watercolors | Synonyms: water-color, water-colour, watercolor |
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| (noun) a painting produced with watercolors | Synonyms: water-color, water-colour, watercolor |
| (noun) a water-base paint (with water-soluble pigments); used by artists | Synonyms: water-color, water-colour, watercolor |
| (noun) water-soluble pigment | Synonyms: water-color, water-colour, watercolor |
| watercolourist | (noun) a painter who paints with watercolors | Synonyms: watercolorist |
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| watercourse | (noun) a conduit through which water flows | Synonyms: waterway |
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| (noun) a natural body of running water flowing on or under the earth | Synonyms: stream |
| (noun) natural or artificial channel through which water flows | - |
| watercraft | (noun) a craft designed for water transportation | Synonyms: vessel |
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| (noun) skill in the management of boats | - |
| watercress | (noun) cresses that grow in clear ponds and streams | - |
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| (noun) any of several water-loving cresses | - |
| waterdog | (noun) any of several large aquatic salamanders | - |
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| waterer | (noun) an assistant who supplies drinking water | Synonyms: water boy |
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| (noun) someone who waters plants or crops | - |
| waterfall | (noun) a steep descent of the water of a river | Synonyms: falls |
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| waterfinder | (noun) forked stick that is said to dip down to indicate underground water or oil | Synonyms: divining rod, dowser, dowsing rod, water finder |
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| waterfowl | (noun) freshwater aquatic bird | Synonyms: water bird, waterbird |
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| waterfront | (noun) the area of a city (such as a harbor or dockyard) alongside a body of water | - |
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| wateriness | (noun) the property of resembling the viscosity of water | - |
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| (noun) meagerness or poorness connoted by a superfluity of water (in a literary style as well as in a food) | - |
| (noun) the wetness of ground that is covered or soaked with water | Synonyms: muddiness, sloppiness |
| watering | (noun) wetting with water | - |
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| (noun) shedding tears | Synonyms: lachrymation, lacrimation, tearing |
| waterleaf | (noun) any of several plants of the genus Hydrophyllum | - |
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| waterlessness | (noun) the condition of not containing or being covered by a liquid (especially water) | Synonyms: dryness, xerotes |
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| waterline | (noun) a line corresponding to the surface of the water when the vessel is afloat on an even keel; often painted on the hull of a ship | Synonyms: water level, water line |
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| waterloo | (noun) a final crushing defeat | - |
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| waterman | (noun) someone who drives or rides in a boat | Synonyms: boater, boatman |
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| watermark | (noun) a distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light | - |
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| (noun) a line marking the level reached by a body of water | Synonyms: water line |
| watermeal | (noun) any of various aquatic plants of the genus Wolffia; throughout warmer regions of the world | - |
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| watermelon | (noun) large oblong or roundish melon with a hard green rind and sweet watery red or occasionally yellowish pulp | - |
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| (noun) an African melon | Synonyms: Citrullus vulgaris, watermelon vine |
| waterpower | (noun) the power to do work that is latent in a head of water | - |
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| waterproof | (noun) a water-resistant coat | Synonyms: raincoat |
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| (noun) any fabric impervious to water | - |
| waterproofing | (noun) the act of treating something to make it repel water | Synonyms: sealing |
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| (noun) a coating capable of making a surface waterproof | - |
| waterproofness | (noun) The condition of being so tightly made that water cannot enter or escape. | Synonyms: watertightness |
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| waters | (noun) the serous fluid in which the embryo is suspended inside the amnion | Synonyms: amnionic fluid, amniotic fluid |
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| waterscape | (noun) a painting of the sea (as distinguished from a landscape) | Synonyms: seascape |
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| watershed | (noun) an event marking a unique or important historical change of course or one on which important developments depend | Synonyms: landmark, turning point |
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| (noun) a ridge of land that separates two adjacent river systems | Synonyms: divide, water parting |
| (noun) the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet | Synonyms: basin, catchment area, catchment basin, drainage area, drainage basin, river basin |
| waterside | (noun) land bordering a body of water | - |
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| waterskin | (noun) a container of skin for holding water | Synonyms: water skin |
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| waterspout | (noun) a channel through which water is discharged (especially one used for drainage from the gutters of a roof) | - |
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| (noun) a tornado passing over water and picking up a column of water and mist | - |
| (noun) a heavy rain | Synonyms: cloudburst, deluge, downpour, pelter, soaker, torrent |
| watertightness | (noun) The condition of being so tightly made that water cannot enter or escape. | Synonyms: waterproofness |
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| watertube | (noun) a boiler tube through which the water flows. | Synonyms: water tube |
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| waterway | (noun) a conduit through which water flows | Synonyms: watercourse |
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| (noun) a navigable body of water | - |
| waterweed | (noun) a weedy aquatic plant of genus Elodea | - |
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| waterwheel | (noun) a wheel that rotates by direct action of water; a simple turbine | Synonyms: water wheel |
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| (noun) a wheel with buckets attached to its rim; raises water from a stream or pond | Synonyms: water wheel |
| waterworks | (noun) workplace where water is stored and purified and distributed for a community | - |
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| (noun) a public utility that provides water | Synonyms: water company |
| watt | (noun) a unit of power equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a resistance of 1 ohm | Synonyms: W |
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| wattage | (noun) the product of voltage and current | Synonyms: electric power, electrical power |
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| wattle | (noun) framework consisting of stakes interwoven with branches to form a fence | - |
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| (noun) a fleshy wrinkled and often brightly colored fold of skin hanging from the neck or throat of certain birds (chickens and turkeys) or lizards | Synonyms: lappet |
| (noun) any of various Australasian trees yielding slender poles suitable for wattle | - |
| wattmeter | (noun) an instrument for measuring in watts the flow of power in an electrical circuit | - |
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