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firewood wood that is burned for cooking or heating.
fireworks devices that burn or explode to make noise, bright lights, or brilliant colors. [2 definitions]
firm1 hard or solid when pressed; not soft. [2 definitions]
firm2 a business started by two or more people.
first before all others in time, importance, or quality. [5 definitions]
first aid emergency medical help given to a hurt or sick person while waiting for a doctor.
first baseman in baseball, the player whose position is at first base while the other team is batting and whose primary function is to defend that base.
first-class of the highest in quality; best. [2 definitions]
firsthand from the source; directly. [2 definitions]
first off at once; immediately.
first-rate of the highest quality; excellent.
fish an animal that lives in water and has fins for swimming and gills for breathing. Fish are cold-blooded animals with skeletons inside their bodies. Most fish have scales on their skin. There are many kinds of fish, including salmon, goldfish, tuna, and sharks. [5 definitions]
fisherman someone who catches fish either as a sport or as a way to make a living.
fishery a business that catches or sells fish and other seafood. [2 definitions]
fishhook a metal hook with a barb and sharp tip, used to catch fish.
fishing the method, pastime, or occupation of catching or trying to catch fish.
fishing rod a long thin pole with a line, hook, and often a reel that is used for catching fish.
fish out of water someone in a place or situation where he or she does not feel comfortable.
fishy like a fish in taste or smell. [3 definitions]
fission the splitting of the nucleus of an atom into two or more nuclei. This makes more atoms of lighter elements and gives off large amounts of energy.
fist a person's hand with the fingers curled tightly into the palm.