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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.
flying being able to fly or seeming to fly. [4 definitions]
flying fish a fish that lives in the ocean and has fins that look like wings. Flying fish can glide in the air after jumping from the water.
flying saucer a bright, flying object shaped like a disk that some people believe is a spacecraft from another world; UFO.
fly off the handle to become very angry; lose one's temper (an informal use).
foal a young horse, donkey, or related animal, usually one that is less than a year old. [2 definitions]
foam a mass of small bubbles that forms on the surface of a liquid. [6 definitions]
foam rubber a firm, light rubber that feels like sponge. Foam rubber is often used to make seats and mattresses.
focus the point at which rays of light or heat come together or from which they seem to move away. [6 definitions]