1874, in the meaning defined above
New Latin Hydra hydra + Greek ánthos "flower" — more at antho-
The word was probably introduced by the Irish-born biologist George James Allman (1812-98) in A Monograph of the Gymnoblastic or Tubularian Hydroids (London, 1871), p. xiv.
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“Hydranth.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydranth. Accessed 17 May. 2022.
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