double fertilization
noun
: fertilization characteristic of flowering plants in which one sperm nucleus fuses with the egg nucleus to form the embryo and another fuses with two polar nuclei to form the endosperm
The discovery of the unique process of double fertilization in flowering plants toward the end of the nineteenth century helped to shed important light on the essential role of a second fusion event in the formation of endosperm in angiosperm seeds.—V. Raghavan
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Merriam-Webster unabridged
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