| DESULFUR | • desulfur v. (Transitive) to remove the sulfur from something (such as petroleum or flue gases). • DESULFUR v. to free from sulphur. |
| FRENULUM | • frenulum n. (Anatomy) A small fold or ridge of tissue that supports or restrains the motion of the part to which… • frenulum n. (Entomology, zootomy) A bristle or row of bristles on the edge of the hindwings of some lepidoptera… • FRENULUM n. (Latin) a connecting fold of membrane, also FRENUM, FRAENUM. |
| FRUSTULE | • frustule n. (Botany) The siliceous shell of a diatom. • FRUSTULE n. the siliceous two-valved shell of a diatom. |
| FURCULAE | • furculae n. Plural of furcula. • furculæ n. (Obsolete) plural of furcula. • FURCULA n. (Latin) the jointed clavicles of a bird, aka wishbone, also FURCULUM. |
| FURFURES | • furfures n. Plural of furfur. • FURFUR n. (Latin) dandruff, also FURFAIR. |
| FURUNCLE | • furuncle n. (Pathology) A boil or infected, inflamed, pus-filled sore. • FURUNCLE n. a painful swelling of the skin. |
| PURSEFUL | • purseful n. As much as a purse can hold. • PURSEFUL n. enough to fill a purse. |
| REFUGIUM | • refugium n. Any local environment that has escaped regional ecological change and therefore provides a habitat for… • refugium n. (Aquaculture) A separate section of a fishtank that shares the same water supply, used for denitrification… • REFUGIUM n. (Latin) a stable area during a period of continental climatic change. |
| RUEFULLY | • ruefully adv. In a rueful manner; causing, feeling, or expressing regret or sorrow. • RUEFUL adv. feeling sorrow or remorse. |
| RUFOUSES | • RUFOUS n. a reddish or brownish-red colour. |
| SULFURED | • sulfured v. Simple past tense and past participle of sulfur. • sulfured adj. Treated with sulfur. • SULFUR v. to treat with sulfur, also SULPHUR. |
| SULFURET | • sulfuret n. (Obsolete, chemistry) A sulfide. • sulfuret v. (Obsolete, chemistry) To sulfurize. • SULFURET v. to treat with sulfur, also SULPHURET. |
| SURGEFUL | • surgeful adj. (Archaic) Abounding in surges. • SURGEFUL adj. full of surges. |
| UDDERFUL | • udderful adj. Having a full udder. • udderful n. Enough to fill an udder. • UDDERFUL n. the contents of a full udder. |
| UNDERFUR | • underfur n. The thick, soft undercoat of some mammals, especially those that spend time in the water. • UNDERFUR n. the thick, soft fur beneath the outer coat of certain mammals. |
| UNFURLED | • unfurled v. Simple past tense and past participle of unfurl. • UNFURL v. to unroll. |
| UNFURRED | • unfurred adj. Not furred. • unfurred v. Simple past tense and past participle of unfur. • UNFURRED adj. without fur. |
| UNRUFFLE | • unruffle v. (Transitive) To remove ruffles from; to make smooth. • unruffle v. (Transitive) To calm or soothe (a person). • unruffle v. (Intransitive) To calm down. |
| UNTURFED | • unturfed v. Simple past tense and past participle of unturf. • unturfed adj. Not having a covering of turf. • UNTURF v. to strip of turf. |
| UPFURLED | • upfurled v. Simple past tense and past participle of upfurl. • UPFURL v. to roll up. |