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).
Derivatives:
prognostically adv.
Etymology: ME f. OF pronostique f. L prognosticum f. Gk prognostikon neut. of prognostikos (as PROGNOSIS)