| aqua | (noun) a shade of blue tinged with green | Synonyms: aquamarine, cobalt blue, greenish blue, peacock blue, turquoise |
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| aquacultural | (adjective) of or relating to aquiculture | Synonyms: aquicultural, hydroponic |
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| aquaculture | (noun) rearing aquatic animals or cultivating aquatic plants for food | - |
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| aqualung | (noun) a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus | Synonyms: Aqua-Lung, scuba |
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| aquamarine | (noun) a shade of blue tinged with green | Synonyms: aqua, cobalt blue, greenish blue, peacock blue, turquoise |
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| (noun) a transparent variety of beryl that is blue green in color | - |
| aquanaut | (noun) an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder | Synonyms: skin-diver |
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| (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: oceanaut |
| aquaphobia | (noun) a morbid fear of drowning | - |
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| aquaphobic | (adjective) abnormally afraid of water | Synonyms: hydrophobic |
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| aquaplane | (noun) a board that is pulled by a speedboat as a person stands on it and skims over the top of the water | - |
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| (verb) ride on an aquaplane | - |
| (verb) rise up onto a thin film of water between the tires and road so that there is no more contact with the road | - |
| aquarium | (noun) a tank or pool or bowl filled with water for keeping live fish and underwater animals | Synonyms: fish tank, marine museum |
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| aquatic | (adjective) operating or living or growing in water | - |
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| (adjective) relating to or consisting of or being in water | - |
| (noun) a plant that lives in or on water | - |
| aquatics | (noun) sports that involve bodies of water | Synonyms: water sport |
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| aquatint | (noun) a method of etching that imitates the broad washes of a water color | - |
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| (noun) an etching made by a process that makes it resemble a water color | - |
| (verb) etch in aquatint | - |
| aquavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: akvavit |
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| aqueduct | (noun) a conduit that resembles a bridge but carries water over a valley | - |
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| aqueous | (adjective) produced by the action of water | Synonyms: sedimentary |
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| (adjective) similar to or containing or dissolved in water | - |
| aquicultural | (adjective) of or relating to aquiculture | Synonyms: aquacultural, hydroponic |
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| aquiculture | (noun) a technique of growing plants (without soil) in water containing dissolved nutrients | Synonyms: hydroponics, tank farming |
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| aquifer | (noun) underground bed or layer yielding ground water for wells and springs etc | - |
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| aquiferous | (adjective) of or relating to an aquifer | - |
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| aquilege | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilegia, columbine |
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| aquilegia | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, columbine |
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| aquiline | (adjective) curved down like an eagle's beak | Synonyms: hooked |
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| claque | (noun) a group of followers hired to applaud at a performance | - |
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| faqir | (noun) a Muslim or Hindu mendicant monk who is regarded as a holy man | Synonyms: fakeer, fakir, faquir |
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| faquir | (noun) a Muslim or Hindu mendicant monk who is regarded as a holy man | Synonyms: fakeer, fakir, faqir |
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| macaque | (noun) short-tailed monkey of rocky regions of Asia and Africa | - |
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| maquiladora | (noun) an assembly plant in Mexico (near the United States border); parts are shipped into Mexico and the finished product is shipped back across the border | - |
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| methaqualone | (noun) sedative-hypnotic drug (trade name Quaalude) that is a drug of abuse | Synonyms: Quaalude |
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| opaque | (adjective) not transmitting or reflecting light or radiant energy; impenetrable to sight | - |
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| (adjective) hard or impossible to understand | Synonyms: unintelligible |
| opaquely | (adverb) in an opaque manner | - |
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| opaqueness | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opacity |
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| (noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opacity |
| paraquat | (noun) a poisonous yellow solid used in solution as a herbicide | - |
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| paraquet | (noun) any of numerous small slender long-tailed parrots | Synonyms: parakeet, paroquet, parrakeet, parroket, parroquet |
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| plaque | (noun) a memorial made of brass | Synonyms: brass, memorial tablet |
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| (noun) (pathology) a small abnormal patch on or inside the body | - |
| primaquine | (noun) synthetic antimalarial drug | - |
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| quiaquia | (noun) small fusiform fish of western Atlantic | Synonyms: cigarfish, Decapterus punctatus, round scad |
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| radiopaque | (adjective) not transparent to X-rays or other forms of radiation | Synonyms: radio-opaque |
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| saquinavir | (noun) a weak protease inhibitor (trade name Invirase) used in treating HIV | Synonyms: Invirase |
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| seaquake | (noun) an earthquake at the sea bed | Synonyms: submarine earthquake |
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| semiaquatic | (adjective) partially aquatic; living or growing partly on land and partly in water | Synonyms: subaquatic |
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| (adjective) having an aquatic early or larval form and a terrestrial adult form | Synonyms: amphibiotic |
| semiopaque | (adjective) partially opaque | - |
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| subaquatic | (adjective) partially aquatic; living or growing partly on land and partly in water | Synonyms: semiaquatic |
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| (adjective) growing or remaining under water | Synonyms: subaqueous, submerged, submersed, underwater |
| subaqueous | (adjective) growing or remaining under water | Synonyms: subaquatic, submerged, submersed, underwater |
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| vaquero | (noun) local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California) | Synonyms: buckaroo, buckeroo |
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| vaquita | (noun) a short porpoise that lives in the Gulf of California; an endangered species | Synonyms: Phocoena sinus |
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