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prognostic (adj.)

"indicating something in the future by signs or symptoms," mid-15c., pronostik, c. 1600, from Medieval Latin pronosticus, prognosticus, from Greek prognōstikos "foreknowing," from progignōskein "come to know beforehand" (see prognosis). The -g- in the English word was restored 16c. Related: Prognostical (early 15c., pronostical).

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Definitions of prognostic from WordNet
1
prognostic (n.)
a sign of something about to happen;
2
prognostic (adj.)
of or relating to prediction; having value for making predictions;
Synonyms: predictive / prognosticative
From wordnet.princeton.edu