number cruncher

Noun
  1. Someone able to perform complex and lengthy calculations (synset 109906830)
    is a type of: calculator, computer, estimator, figurer, reckoner - an expert at calculation (or at operating calculating machines)
  2. A computer capable of performing a large number of mathematical operations per second (synset 103841102)
    is a type of: computer, computing device, computing machine, data processor, electronic computer, information processing system - a machine for performing calculations automatically

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