watermark
nounUK /ˈwɔːtəmɑːk/
US /ˈwɔːtərmɑːrk/
A faint picture or word you can see on paper when you hold it up to the light.
The letter paper had a small watermark of a lion in the corner.
OTHER MEANINGS
2. A line showing how high water has risen on a wall or post.
The flood left a watermark halfway up the door.
3. A faint logo placed over a digital photo to show who owns it.
The photographer added a watermark to every picture online.
4. To put a faint mark on paper or a picture.
They watermark each sheet before it leaves the factory.