n. & adj.
n. 1 (often foll. by of) an advance indication or omen, esp. of the course of a disease etc. 2 a prediction; a forecast.
adj. foretelling; predictive (prognostic of a good result). prognostically adv.
[ ME f. OF pronostique f. L prognosticum f. Gk prognostikon neut. of prognostikos (as PROGNOSIS) ]