| DIFFUSOR | • diffusor n. Alternative form of diffuser. • DIFFUSOR n. one that diffuses, also DIFFUSER. |
| FIDDIOUS | • FIDDIOUS v. (Shakespeare) to treat as leniently as Coriolanus treated Aufidius. |
| FLUORIDE | • fluoride n. (Chemistry) Any salt of hydrofluoric acid; for example, potassium fluoride. • fluoride n. (Chemistry) A binary compound of fluorine and another element or radical. • FLUORIDE n. a compound of fluorine, also FLUORID. |
| FLUORIDS | • fluorids n. Plural of fluorid. • FLUORID n. a compound of fluorine, also FLUORIDE. |
| FONDUING | • fonduing v. Present participle of fondue. • FONDU v. (French) to cook a dish of melted cheese, also FONDUE. |
| FOUDRIES | • foudries n. Plural of foudrie. • FOUDRIE n. the jurisdiction of a foud or bailiff in the Orkneys. |
| FOUNDING | • founding v. Present participle of found. • founding n. The establishment of something. • founding adj. Who or that founds (establishes or starts) or founded. |
| FROIDEUR | • froideur n. A cold or indifferent manner. • froideur n. (Usually italicized) A chill in relations. • FROIDEUR n. (French) coolness in personal relationships. |
| FUCOIDAL | • fucoidal adj. (Botany) fucoid. • fucoidal adj. (Geology) Containing impressions of fossil fucoids or seaweeds. • FUCOIDAL adj. relating to seaweed, also FUCOID. |
| FUNGOIDS | • fungoids n. Plural of fungoid. • FUNGOID n. a fungus. |
| NONFLUID | • nonfluid n. A substance that is not a fluid. • NONFLUID n. a substance that is not a fluid. |
| OUTFIELD | • outfield n. (Baseball, softball) The region of the field between the infield and the outer fence. • outfield n. (Cricket) The region of the field roughly outside of the infield or the wicket-keeper, slips, gully… • outfield n. The area outside a racetrack or running track. |
| OUTFINDS | • outfinds v. Third-person singular simple present indicative form of outfind. • OUTFIND v. to surpass in finding. |
| OUTFIRED | • outfired v. Simple past tense and past participle of outfire. • OUTFIRE v. to surpass in firing. |
| UNFOILED | • unfoiled adj. Not foiled. • UNFOILED adj. not foiled. |
| UNFORBID | • unforbid adj. (Obsolete) unforbidden. • UNFORBID adj. (Milton) not forbidden. |