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fluency the ability to speak or write smoothly and easily in another language.
fluent speaking or writing easily and smoothly. [4 definitions]
flue pipe an organ pipe in which sound is produced by a current of air that vibrates as it strikes the lip of an opening in the side of the pipe; flue.
fluff a soft, light, downlike substance, or a mass of such a substance. [7 definitions]
fluffy of, made of, or covered with fluff. [2 definitions]
fluid a substance, such as a liquid or gas, that can flow and that tends to conform to the shape of its container. [5 definitions]
fluid dram in the U.S., a unit of capacity equal to one eighth of a fluid ounce or 3.6966 milliliters. [2 definitions]
fluid ounce in the US, a unit of capacity equal to one sixteenth of a pint or 29.57 milliliters. [2 definitions]
fluke1 a triangular tip, as on an anchor or the head of a spear or arrow. [2 definitions]
fluke2 that which is accidentally successful; stroke of good luck.
fluke3 any of several flatfishes or flounderlike fishes.
fluky (informal) resulting from chance; accidental or lucky. [2 definitions]
flume a narrow gorge or ravine through which a stream flows. [3 definitions]
flummery any of several soft, thick, bland foods, such as boiled oatmeal or custard. [2 definitions]
flummox (informal) to confuse or puzzle.
flung past tense and part participle of fling.
flunk (informal) to be unsuccessful; fail, as a student in an examination or course. [3 definitions]
flunk out (informal) to be dismissed from a school because of failing grades.
flunky one who does unskilled, menial, or trivial tasks. [3 definitions]
fluor calcium fluoride; fluorite. [2 definitions]
fluoresce to exhibit, produce, or undergo radiation, esp. to emit visible light during or after exposure to radiation.