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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.
flycatcher a bird that lives in Europe and America and eats insects that it catches in the air. There are many different kinds of flycatchers.