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stonewort

[stohn-wurt, -wawrt]
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noun
  1. 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 of stonewort

First recorded in 1575–85; stone + wort2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for stonewort

stonewort

noun
  1. any of various green algae of the genus Chara, which grow in brackish or fresh water and have jointed fronds encrusted with lime
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012