Meaning of double fertilization

dou'ble fertiliza'tion

Pronunciation: [key]
  1. the fertilization process characteristic of flowering plants, in which one sperm cell of a pollen grain fertilizes an egg cell while a second fuses with two polar nuclei to produce a triploid body that gives rise to the endosperm.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.