| DISFORESTS | • disforests v. Third-person singular simple present indicative form of disforest. • DISFOREST v. to clear of forest, also DISAFFOREST. |
| FACTORISES | • factorises v. Third-person singular simple present indicative form of factorise. • FACTORISE v. to reduce a number to its prime factors, also FACTORIZE. |
| FIRESTONES | • firestones n. Plural of firestone. • Firestones prop.n. Plural of Firestone. • FIRESTONE n. a rock, esp. sandstone, that can withstand great heat. |
| FIRESTORMS | • firestorms n. Plural of firestorm. • fire␣storms n. Plural of fire storm. • FIRESTORM n. a huge blaze (especially a result of heavy bombing) which fans its own flames by creating its own draught. |
| FORESIGHTS | • foresights n. Plural of foresight. • FORESIGHT n. the act or power of foreseeing. |
| FORESKIRTS | • foreskirts n. Plural of foreskirt. • FORESKIRT n. (Shakespeare) the front skirt of a garment, in distinction from the train. |
| FORESTAIRS | • forestairs n. Plural of forestair. • FORESTAIR n. (Scots) an outside stair at the front of a house. |
| FORESTRIES | • forestries n. Plural of forestry. • FORESTRY n. the science of planting and managing forests. |
| FORTUNISES | • fortunises v. Third-person singular simple present indicative form of fortunise. • FORTUNISE v. to make happy or fortunate, also FORTUNIZE. |
| FOSTERINGS | • fosterings n. Plural of fostering. • FOSTERING n. the act of nurturing. |
| FRESCOISTS | • frescoists n. Plural of frescoist. • FRESCOIST n. one who paints frescos, also FRESCOER. |
| FROSTBITES | • frostbites n. Plural of frostbite. • FROSTBITE v. to affect with frostbite. |
| FROSTINESS | • frostiness n. The quality of being frosty. • FROSTINESS n. the state of being frosty. |
| FROSTLINES | • frostlines n. Plural of frostline. • frost␣lines n. Plural of frost line. • FROSTLINE n. the depth to which the ground freezes in winter. |
| FROTHINESS | • frothiness n. The quality of being frothy. • FROTHINESS n. the state of being frothy. |
| FROWSTIEST | • frowstiest adj. Superlative form of frowsty: most frowsty. • FROWSTY adj. fusty, stuffy, also FROUZY, FROWSY, FROWZY. |
| PROFITLESS | • profitless adj. Not yielding profit. • PROFITLESS adj. without profit. |
| REFORMISTS | • reformists n. Plural of reformist. • REFORMIST n. a reformer. |
| SETIFEROUS | • setiferous adj. Having bristles; bristly. • SETIFEROUS adj. bearing bristles, also SETIGEROUS. |
| SHOTFIRERS | • shotfirers n. Plural of shotfirer. • SHOTFIRER n. the mining worker who fires the blasting charges. |