| furfural | (noun) a liquid aldehyde with a penetrating odor; made from plant hulls and corncobs; used in making furan and as a solvent | Synonyms: furfuraldehyde |
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| furfuraldehyde | (noun) a liquid aldehyde with a penetrating odor; made from plant hulls and corncobs; used in making furan and as a solvent | Synonyms: furfural |
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| furfuran | (noun) a colorless toxic flammable liquid used in the synthesis of nylon | Synonyms: furan, furane |
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| underfur | (noun) thick soft fur lying beneath the longer and coarser guard hair | Synonyms: undercoat |
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