1. Of, relating to, or useful in prognosis.
2. Of or relating to prediction; predictive.
1. A sign or symptom indicating the future course of a disease.
2. A sign of a future happening; a portent.
[Middle English pronostik, prognosticating, omen, from Medieval Latin prognōsticus, prognosticating, from Greek prognōstikos, from prognōsis, foreknowledge; see PROGNOSIS. N., from Latin prognōsticum, omen, from Greek prognōstikon, from neuter of prognōstikos.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.