Search Result for "megagametophyte": 
Wordnet 3.0

NOUN (1)

1. the female gametophyte produced by the megaspore of a plant that produces both microspore and megaspores; 



WordNet (r) 3.0 (2006):

megagametophyte
    n 1: the female gametophyte produced by the megaspore of a plant
         that produces both microspore and megaspores