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 for coprocessor
From The Free On-line Dictionary of Computing (30 December 2018) :

     Any computer processor which assists the main processor (the
     "{CPU") by performing certain special functions, usually much
     faster than the main processor could perform them in software.
     The coprocessor often decodes instructions in parallel with
     the main processor and executes only those instructions
     intended for it.
     The most common example is a floating point coprocessor (or
     "{FPU"), others are graphics and networking.

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