1. One that booms: an amp that is a real boomer.
2. Informal A baby boomer.
3. Informal A nuclear submarine armed with ballistic missiles.
4. A transient worker, especially in bridge construction.
5. Australian A large, fully grown male kangaroo.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. 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.