1875, in the meaning defined above
hypobenthos
hypoblast
hypobranchial
“Hypoblast.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hypoblast. Accessed 22 Dec. 2024.
called also endoblast, entoblast
Britannica.com: Encyclopedia article about hypoblast
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