damp·er  (d ăm p ər)
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n.1. One that deadens, restrains, or depresses: Rain put a damper on our picnic plans. 2. An adjustable plate, as in the flue of a furnace or stove, for controlling the draft. 3. Music a. A device in various keyboard instruments for deadening the vibrations of the strings. b. A mute for various brass instruments. 4. A device that eliminates or diminishes vibrations or oscillations, as of a magnetic needle. |
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:
Indo-European Roots
Semitic Roots
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.
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