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ancient Rome a civilization cultivated by the city-state of Rome from the 8th century B.C.E. through its development as a republic and its collapse as an empire in the 5th century A.D.
armature a coil-wrapped iron core that rotates in a magnetic field to induce electrical current in a generator, or that produces motion in an electrical motor when current is passed through it. [1/4 definitions]
bead a small, generally round object, usu. made of glass, wood, or the like with a hole through its center for stringing to make necklaces or for decorating clothing. [1/8 definitions]
filament in an electrical device such as a light bulb, a fine wire that lights or heats up when current is passed through it. [1/3 definitions]
filter a piece of paper or other porous material, such as charcoal, used to remove solids or other impurities from fluids or gases that pass through it. [1/7 definitions]
guideway a channel or groove that defines the path for something moving through it. [1/2 definitions]
gulch a stony ravine with steep sides, esp. one having a seasonal stream running through it.
lens a piece of molded or ground transparent material such as glass, whose surfaces are curved so as to cause the divergence or convergence of light rays passing through it. [1/3 definitions]
magnifying glass a lens that enlarges the image of objects seen through it.
permeable of a substance, being such that gas or liquid can penetrate or diffuse through it.
pinchcock a clamp fitted onto a flexible tube to regulate or prevent the flow of liquid through it.
Polaroid trademark for a substance able to polarize light passing through it, used to reduce glare. [1/2 definitions]
quartz lamp a mercury-vapor lamp, enclosed within transparent quartz, that emits ultraviolet rays when an electric current is passed through it.
solenoid a coil of wire, usu. in spiral form, that produces a magnetic field when electricity flows through it. [1/2 definitions]
storage cell a cell that may be recharged by passing an electric current through it in the direction opposite to the flow of current it discharges.
turbidimeter an instrument that measures the turbidity of a fluid by the degree of scattering of a light beam passed through it.
water gap a crosswise break in a mountain ridge, cut by the stream that flows through it.
well2 a vertical space within a building that extends through its floors and contains the stairs, an elevator, or heat and air shafts. [1/7 definitions]