Develops in ovule into a female gametophyte

• Larger of the two types of spore produced in heterosporous plants

Wikipedia Word definitions in Wikipedia
Megaspores , also called macrospores , are a type of spore that is present in heterosporous plants . These plants have two spore types, megaspores and microspores . Generally speaking, the megaspore, or large spore, germinates into a female gametophyte ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1857, from mega- + spore .

Wiktionary Word definitions in Wiktionary
n. (context botany English) The larger spore of a heterosporous plant, typically producing a female gametophyte

WordNet Word definitions in WordNet
n. larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte [syn: macrospore ]