| 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. |
| fluorescence |
the giving off of electromagnetic radiation, esp. in the form of visible light, during or after exposure to radiation from another source such as ultraviolet light or x-rays. [2 definitions] |
| fluorescent |
able to react to external radiation by emitting electromagnetic radiation, usu. in the form of visible light. |