| aqua | (noun) a shade of blue tinged with green | Synonyms: aquamarine, cobalt blue, greenish blue, peacock blue, turquoise |
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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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| 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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| 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 | (noun) a plant that lives in or on water | - |
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| 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 | - |
| 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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| 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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| 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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