a. A pipe or channel designed to transport water from a remote source, usually by gravity.
b. A bridgelike structure supporting a conduit or canal passing over a river or low ground.
2. Anatomy A channel or passage in an organ or a body part, especially such a channel for conveying fluid.
(click for a larger image)aqueduct
Pont du Gard,
near Nîmes, France
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.