tr.v. ex·tin·guished, ex·tin·guish·ing, ex·tin·guish·es
1. To cause (a fire or light) to stop burning or shining; put out.
2. To put an end to or make extinct; destroy: "Her death extinguished the dream of family that was closest to his heart" (Karen Lystra). See Synonyms at annihilate.
3. Psychology To bring about the extinction of (a conditioned response).
[Latin exstinguere : ex-, intensive pref.; see EX- + stinguere, to quench; see steig- 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.