pro·tec·tor also pro·tect·er (prə-tĕktər)
1. One who protects; a guardian.
2. A device that protects; a guard.
a. A person who rules a kingdom during the minority of a sovereign.
b. The head of the Commonwealth of England, Scotland, and Ireland from 1653 to 1659.
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.