: 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
Recent Examples on the Web These double fertilization events seem to explain at least some honeybee gynandromorphs, though male-female hybrids in other species can manifest in other ways. —Katherine J. Wu, Smithsonian Magazine, 2 Apr. 2020
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'double fertilization.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
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