skep·tic also scep·tic (skĕptĭk)
1. One who instinctively or habitually doubts, questions, or disagrees with assertions or generally accepted conclusions.
2. One inclined to skepticism in religious matters.
a. often Skeptic An adherent of a school of skepticism.
b. Skeptic A member of an ancient Greek school of skepticism, especially that of Pyrrho of Elis (360?-272? BC).
[Latin Scepticus, disciple of Pyrrho of Elis, from Greek Skeptikos, from skeptesthai, to examine; see spek- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.