any of several North American, aquatic plants of the genus Proserpinaca, having pinnately dissected leaves either above or below the water.
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Origin of mermaid weed
An Americanism dating back to 1810–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for mermaid weed
One of the most common plants is the mermaid-weed (Proserpinaca).