watermark

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a line marking the level reached by a body of water (Freq. 1)
• Syn:
water line
• Hypernyms:
line
• Hyponyms:
high-water mark, low-water mark
2. a distinguishing mark impressed on paper during manufacture;
visible when paper is held up to the light
• Hypernyms:
marker, marking, mark