prog·nos·ti·ca·tor \-ˌkād.ə(r), -ātə-\noun (-s) Etymology: Middle French prognosticateur, from Medieval Latin prognosticatus + Middle French -eur -or : one that prognosticates < weather prognosticators — G.S.Perry > • prog·nos·ti·ca·to·ry\-_kəˌtōrē\adjective