estimator

from WordNet (r) 3.0 (2006)

estimator
    n 1: an expert at calculation (or at operating calculating
         machines) [syn: {calculator}, {reckoner}, {figurer},
         {estimator}, {computer}]

from The Collaborative International Dictionary of English v.0.48

Estimator \Es"ti*ma`tor\, n. [L. aestimator.]
   One who estimates or values; a valuer. --Jer. Taylor.
   Estivate
   Estival

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