Definition of water fern
1
: a fern ally of the families Salviniaceae or Marsileaceae
2
: a fern of the genus Osmunda (especially O. regalis)
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“Water fern.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20fern. Accessed 17 May. 2021.
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