1. The act of linking together or forming couples.
2. The act of uniting sexually.
3. A device that links or connects.
4. Electronics The transfer of electricity from one circuit to another.
5. Chemistry Facilitation or acceleration of one chemical process due to the presence or action of another.
6. The body part of a four-footed animal that connects the hindquarters to the forequarters.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.