water moss

noun

1
: an aquatic plant (as various algae or liverworts) that suggests a moss in appearance or habit of growth
2
: a moss of the genus Fontinalis (especially F. antipyretica)

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“Water moss.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20moss. Accessed 3 Dec. 2022.

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