1877, in the meaning defined above
ultimately from Greek platys broad, flat + helminth-, helmis helminth
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Cite this Entry
“Platyhelminth.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/platyhelminth. Accessed 20 Oct. 2020.
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— called also flatworm
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Britannica.com: Encyclopedia article about platyhelminth
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