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A bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil
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The chamber of a nuclear reactor containing the fissile material where the reaction takes place
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(computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories
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The choicest or most essential or most vital part of some idea or experience
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The central meaning or theme of a speech or literary work
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A small group of indispensable persons or things
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An organization founded by James Leonard Farmer in 1942 to work for racial equality
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The center of an object
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The central part of the Earth
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A cylindrical sample of soil or rock obtained with a hollow drill
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Remove the core or center from