"watercress" in the noun sense
1. watercress
any of several water-loving cresses
2. watercress
cresses that grow in clear ponds and streams
"watercress" in the adjective sense
1. cress green, cresson, watercress
of a moderate yellow-green color that is greener and deeper than moss green and yellower and darker than pea green
Source: WordNet® (An amazing lexical database of English)
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