double fertilization
noun
: fertilization characteristic of a flowering plant in which one sperm cell fuses with the egg to form a zygote and another fuses with the 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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