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bead a small, round object made of material such as glass, wood, or plastic. A bead has a small hole through its center so it can be put on a string to make necklaces or to decorate clothing. [1/3 definitions]
circuit breaker a switch or other device that automatically breaks an electric circuit when too much electricity flows through it.
cross out to remove something by drawing a line through it.
cross section a part of something made visible by cutting straight through it. [1/2 definitions]
filament a fine wire that lights or heats up when electric current is passed through it. [1/2 definitions]
gulch a rocky valley with steep sides. A gulch sometimes has a stream running through it.
lens a piece of clear material such as glass that bends light rays passing through it. The surface of a lens is curved to bend light rays toward or away from a central point. [1/3 definitions]
magnifying glass a lens that makes objects seen through it appear larger.
neon a gas that is one of the chemical elements. Neon is used in making electric signs, because it glows orange when an electric current passes through it. (symbol: Ne) [1/2 definitions]