aestĭmātor (noun M) : aestimo.
* One that estimates a thing according to its extrinsic value, a valuer, appraiser: frumenti,Cic. Pis. 35 fin.: callidi rerum aestimatores prata et areas quasdam magno aestimant,id. Par. 6, 3.
* Trop., an estimator or valuer of a thing according to its intrinsic worth (while existimator is a judge): nemo erit tam injustus rerum aestimator, qui dubitet, etc.,Cic. Marcell. 5: justus rerum aestimator,id. Or. 41: immodicus aestimator sui,Curt. 8, 1 al.

s. TLL