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stonewort

stonewort

noun stone·wort \-ˌwərt, -ˌwrt\

Definition of STONEWORT

:  any of various freshwater green algae (order Charales) that have a thallus differentiated into rhizoids and stems with whorls of branchlets and that are often encrusted with calcareous deposits

First Known Use of STONEWORT

1816

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