A small, circular medicinal lozenge; a pastille.
[Back-formation from Middle English trocis, troches (taken as pl.), from Old French trocisse, from Late Latin trochiscus, from Greek trokhiskos, diminutive of trokhos, wheel, from trekhein, to run.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.