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Children's Dictionary
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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]
fodder feed for farm animals, such as stalks of corn cut and mixed with hay.
foe one who wishes ill on another; personal enemy.
fog a thick mass, like a cloud, made up of tiny water drops floating in the air near the ground; mist. [4 definitions]
foggy full of or covered by fog. [2 definitions]
foghorn a loud, deep horn on a ship or on the shore, used in fog or at night to give warning signals.
foil2 a very thin, flexible sheet of a metal, such as aluminum.
-fold a suffix that means "multiplied by" or "times." [2 definitions]