reckoner

Noun
  1. An expert at calculation (or at operating calculating machines) (synset 109906486)
    is a type of: expert - a person with special knowledge or ability who performs skillfully
    subtypes:
    • adder - a person who adds numbers
    • number cruncher - someone able to perform complex and lengthy calculations
    • actuary, statistician - someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums)
    • subtracter - a person who subtracts numbers
    same as: calculator, computer, estimator, figurer
  2. A handbook of tables used to facilitate computation (synset 106435139)
    is a type of: enchiridion, handbook, vade mecum - a concise reference book providing specific information about a subject or location
    same as: ready reckoner

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