| flown |
a past participle of "fly1." |
| flu |
a short form of the word "influenza." |
| flue |
a hollow pipe inside a chimney that lets hot or cold air, smoke, or steam escape to the outside. |
| fluent |
able to speak or write easily and naturally. |
| fluff |
a soft, light material, or a mass of such a material. [2 definitions] |
| fluffy |
of, made of, or covered with fluff. [2 definitions] |
| fluid |
a liquid or gas. A fluid flows easily and takes the shape of the container that holds it. Water and air are fluids. [2 definitions] |
| fluke2 |
something that is accidental good luck. |
| flung |
past tense and past participle of "fling." |
| fluorescent |
able to give off visible light after being exposed to a source of heat, light, or other form of energy. |
| fluoridate |
to add a fluoride to, in order to keep teeth healthy. |
| fluoride |
a chemical compound that contains fluorine as one of its elements. |
| fluorine |
a substance that is a chemical element. Fluorine combines easily with other elements to form compounds. Some of these compounds are used to prevent tooth decay. Fluorine is poisonous in its pure gas form. (symbol: F) |
| flurry |
a light fall of snow that ends quickly. [2 definitions] |
| flush1 |
a brief, heavy flow of water or other liquid. [7 definitions] |
| flush2 |
even or level with another surface or line. [2 definitions] |
| fluster |
to cause to become nervous, confused, or upset. [2 definitions] |
| flute |
a woodwind instrument with a high pitch. It is a long tube with finger holes or keys along it and is played by blowing into a hole near one end. |
| flutter |
to wave rapidly back and forth or up and down. [5 definitions] |
| fly1 |
to move through the air by means of wings. [9 definitions] |
| fly2 |
an insect with two wings. Most flies are active in the daytime, and many have large eyes. Mosquitoes and houseflies are among the thousands of types of flies. |