1
: the condition of having several embryos
2
: the production of two or more embryos from one ovule or egg

Word History

Etymology

poly- + embryon-, stem in combination of embryo + -y entry 2

First Known Use

1849, in the meaning defined at sense 1

Time Traveler
The first known use of polyembryony was in 1849

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Cite this Entry

“Polyembryony.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/polyembryony. Accessed 8 Jul. 2026.

Medical Definition

plural polyembryonies
: the production of two or more embryos from one ovule or egg

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