1. One that drives, as the operator of a motor vehicle.
2. A tool, such as a screwdriver or hammer, that is used for imparting forceful pressure on another object.
3. A machine part that transmits motion or power to another part.
4. A piece of software that enables a computer to communicate with a specific hardware device. Also called device driver.
5. A golf club with a wide head and a long shaft, used for making long shots from the tee.
6. Nautical A jib-headed spanker.
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.