1. A part, as of a musical instrument or a telephone, that functions in or near the mouth.
2. Sports A rubber or flexible plastic protective device worn over the teeth, as by boxers.
3. Informal One, such as a spokesperson, through which views are expressed.
4. Slang A lawyer.
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.