Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun megaspore
1 sense of megaspore
Sense 1
megaspore, macrospore -- (larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte)
=> spore -- (a small usually single-celled asexual reproductive body produced by many nonflowering plants and fungi and some bacteria and protozoans and that are capable of developing into a new individual without sexual fusion; "a sexual spore is formed after the fusion of gametes")