predictor
noun
1.
someone who makes predictions of the future (usually on the basis of special knowledge)
before-sayer boder foresayer spaeman spaer spaesayer spaewife witier forecaster prognosticator soothsayer
Derived from:
predict 2.
information that supports a probabilistic estimate of future events
3.
a computer for controlling antiaircraft fire that computes the position of an aircraft at the instant of a shell's arrival