Definition of endosperm nucleus
: the triploid nucleus formed in the embryo sac of a seed plant by fusion of a sperm nucleus with two polar nuclei or with a nucleus formed by the prior fusion of the polar nuclei
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“Endosperm nucleus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/endosperm%20nucleus. Accessed 25 Feb. 2021.
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The first known use of endosperm nucleus was circa 1902
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