1. One who plunges or dives.
2. A device consisting of a rubber suction cup attached to the end of a stick, used to unclog drains and pipes. Also called plumber's helper.
3. A part of a machine, tool, or device that operates wtih a thrusting or plunging movement, such as a piston.
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.