prognostic

n. 1 (often foll. By of) advance indication, esp. Of the course of a disease. 2 prediction, forecast. adj. (often foll. By of) foretelling, predictive. [latin: related to *prognosis]

a. Indicating something future by signs or symptoms; foreshowing; aiding in prognosis; as, the prognostic symptoms of a disease; prognostic signs.