watermark

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a line marking the level reached by a body of water
noun a distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light

From water + mark.

Did you look at the watermark of the MS.? — The Journal of Sir Walter Scott: From the Original Manuscript at Abbotsford, Walter Scott
“The note is written upon ordinary cream-laid paper without watermark. — His last bow : $b Some later reminiscences of Sherlock Holmes, Arthur Conan Doyle
[135] The watermarks of 1803 and 1804 on the paper are the sole authority for this date. — Jane Austen, Her Life and Letters: A Family Record, William Austen-Leigh

water line

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