| flue | (noun) a conduit to carry off smoke | - |
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| (noun) organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip | Synonyms: flue pipe, labial pipe |
| (noun) flat bladelike projection on the arm of an anchor | Synonyms: fluke |
| fluegelhorn | (noun) a brass instrument resembling a cornet but with a wider bore | Synonyms: flugelhorn |
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| fluency | (noun) the quality of being facile in speech and writing | Synonyms: articulateness, volubility |
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| (noun) skillfulness in speaking or writing | - |
| (noun) powerful and effective language | Synonyms: eloquence, smoothness |