Emily Dickinson Lexicon

PROG-NOS'TIC, n.

1. In medicine, the judgment formed concerning the course and event of disease by means of the symptoms. – Encyc.
2. Something which foreshows; a sign by which a future event may be known or foretold. In medicine, a sign or symptom indicating the course and event of a disease. The appearance of the tongue … is of considerable importance as a prognostic. – Parr.
3. A foretelling; prediction. – Swift.