| droshky | (noun) an open horse-drawn carriage with four wheels; formerly used in Poland and Russia | Synonyms: drosky |
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| drosky | (noun) an open horse-drawn carriage with four wheels; formerly used in Poland and Russia | Synonyms: droshky |
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| drosophila | (noun) small fruit fly used by Thomas Hunt Morgan in studying basic mechanisms of inheritance | Synonyms: Drosophila melanogaster |
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| dross | (noun) the scum formed by oxidation at the surface of molten metals | Synonyms: scoria, slag |
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| (noun) worthless or dangerous material that should be removed | Synonyms: impurity |