core (kôr)
n.
The central or innermost part.
The part of a nuclear reactor where fission occurs.
core (kôr)
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In geology, the central region of the Earth; it extends fourteen hundred to eighteen hundred miles from the Earth's center.
Note: The core is made primarily of iron and nickel and has two parts — an inner solid core and an outer liquid core.
Note: The mantle is the layer of the Earth that overlies the core.