stone-wort

stonewort

[stohn-wurt, -wawrt]
noun
any of a plantlike group of green algae constituting the class Charophyceae, having a jointed body frequently encrusted with lime and usually attached to the bottom in fresh water.

Origin:
1575–85; stone + wort2

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World English Dictionary
stonewort (ˈstəʊnˌwɜːt)
 
n
any of various green algae of the genus Chara, which grow in brackish or fresh water and have jointed fronds encrusted with lime

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