1870, in the meaning defined above
New Latin, from Greek pro- + stoma mouth — more at stomach entry 1
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Cite this Entry
“Prostomium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prostomium. Accessed 29 Sep. 2022.
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Britannica.com: Encyclopedia article about prostomium
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