wa·ter·mark (wôtər-märk′, wŏtər-)
a. A mark showing the greatest height to which water has risen.
b. A line indicating the heights of high and low tide.
a. A translucent design impressed on paper during manufacture and visible when the paper is held to the light.
b. The metal pattern that produces this design.
3. Information directly encoded into the data portion of an image, video, or audio file that identifies the copyright owner or a licensed user. In image or video files, a watermark may be either visible or invisible.
tr.v. wa·ter·marked, wa·ter·mark·ing, wa·ter·marks
1. To mark (paper) with a watermark.
2. To impress (a pattern or design) as a watermark.
3. To insert (a digital file) with a watermark.
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.