| arabesque | (noun) an ornament that interlaces simulated foliage in an intricate design | - |
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| (noun) position in which the dancer has one leg raised behind and arms outstretched in a conventional pose | - |
| arability | (noun) the quality of land that is appropriate for cultivation | - |
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| arachnid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnoid |
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| arachnoid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnid |
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| (noun) the middle of the 3 meninges | Synonyms: arachnoid membrane |
| arachnophobia | (noun) a morbid fear of spiders | - |
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| aragonite | (noun) a mineral form of crystalline calcium carbonate; dimorphic with calcite | - |
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| arak | (noun) any of various strong liquors distilled from the fermented sap of toddy palms or from fermented molasses | Synonyms: arrack |
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| aralia | (noun) any of various plants of the genus Aralia; often aromatic plants having compound leaves and small umbellate flowers | - |
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| arame | (noun) an edible seaweed with a mild flavor | - |
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| arariba | (noun) Brazilian tree with handsomely marked wood | Synonyms: Centrolobium robustum |
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| araroba | (noun) a bitter yellow powder used to treat skin diseases | Synonyms: chrysarobin, Goa powder |
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| araucaria | (noun) any of several tall South American or Australian trees with large cones and edible seeds | - |
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