| browallia | (noun) any of several herbs of the genus Browallia cultivated for their blue or violet or white flowers | Synonyms: bush violet |
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| chuckwalla | (noun) a herbivorous lizard that lives among rocks in the arid parts of southwestern United States and Mexico | Synonyms: Sauromalus obesus |
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| codswallop | (noun) nonsensical talk or writing | Synonyms: applesauce, folderol, rubbish, trash, tripe, trumpery, wish-wash |
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| drywall | (noun) a wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses | Synonyms: dry wall, wallboard |
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| firewall | (noun) (colloquial) the application of maximum thrust | - |
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| (noun) a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle | - |
| (noun) (computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet | - |
| footwall | (noun) the lower wall of an inclined fault | - |
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| paywall | (noun) A mechanism used to limit access to only paying users | - |
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| seawall | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: breakwater, bulwark, groin, groyne, jetty, mole |
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| sidewall | (noun) a wall that forms the side of a structure | - |
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| (noun) the side of an automobile tire | - |
| stonewaller | (noun) one who stonewalls or refuses to answer or cooperate; someone who delays by lengthy speeches etc. | - |
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| stonewalling | (noun) stalling or delaying especially by refusing to answer questions or cooperate | - |
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| swallow | (noun) the act of swallowing | Synonyms: deglutition, drink |
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| (noun) small long-winged songbird noted for swift graceful flight and the regularity of its migrations | - |
| (noun) a small amount of liquid food | Synonyms: sup |
| swallowtail | (noun) a man's full-dress jacket with two long tapering tails at the back | Synonyms: morning coat, swallow-tailed coat |
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| swallowwort | (noun) perennial herb with branched woody stock and bright yellow flowers | Synonyms: celandine, Chelidonium majus, greater celandine, swallow wort |
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| (noun) tropical herb having orange-red flowers followed by pods suggesting a swallow with outspread wings; a weed throughout the tropics | Synonyms: Asclepias curassavica, blood flower |
| wall | (noun) an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure | - |
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| (noun) an embankment built around a space for defensive purposes | Synonyms: bulwark, rampart |
| (noun) a masonry fence (as around an estate or garden) | - |
| (noun) a layer of material that encloses space | - |
| (noun) (anatomy) a layer (a lining or membrane) that encloses a structure | Synonyms: paries |
| (noun) anything that suggests a wall in structure or function or effect | - |
| (noun) a vertical (or almost vertical) smooth rock face (as of a cave or mountain) | - |
| (noun) a difficult or awkward situation | - |
| wallaby | (noun) any of various small or medium-sized kangaroos; often brightly colored | Synonyms: brush kangaroo |
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| wallah | (noun) usually in combination: person in charge of or employed at a particular thing | - |
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| wallboard | (noun) a wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses | Synonyms: dry wall, drywall |
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| wallet | (noun) a pocket-size case for holding papers and paper money | Synonyms: billfold, notecase, pocketbook |
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| walleye | (noun) pike-like freshwater perches | Synonyms: dory, jack salmon, Stizostedion vitreum, walleyed pike |
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| (noun) strabismus in which one or both eyes are directed outward | Synonyms: divergent strabismus, exotropia |
| wallflower | (noun) remains on sidelines at social event | - |
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| (noun) perennial of southern Europe having clusters of fragrant flowers of all colors especially yellow and orange; often naturalized on old walls or cliffs; sometimes placed in genus Erysimum | Synonyms: Cheiranthus cheiri, Erysimum cheiri |
| (noun) any of numerous plants of the genus Erysimum having fragrant yellow or orange or brownish flowers | - |
| wallop | (noun) a severe blow | - |
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| (noun) a forceful consequence; a strong effect | Synonyms: impact |
| walloper | (noun) a gross untruth; a blatant lie | Synonyms: whopper |
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| (noun) a winner by a wide margin | - |
| (noun) a very hard hitter | - |
| walloping | (noun) a sound defeat | Synonyms: debacle, drubbing, slaughter, thrashing, trouncing, whipping |
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| wallow | (noun) an indolent or clumsy rolling about | - |
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| (noun) a puddle where animals go to wallow | - |
| wallpaper | (noun) a decorative paper for the walls of rooms | - |
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| wallpaperer | (noun) a worker who papers walls | Synonyms: wall-paperer |
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| wally | (noun) a silly and inept person; someone who is regarded as stupid | - |
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