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core definition

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1 : a region of a crystal that has different characteristics from the rest of the crystal, usually higher dopant density. 2 : on a polished monocrystalline gadolinium gallium garnet wafer, a material defect caused by nonplanar growth interface. This defect normally is highly stained and misoriented with respect to the surrounding area. [SEMI M7-82]

See also:

cryptand definition
cresols definition
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coprocessor definition