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Definition of Megaspore
1. Noun. Larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte.
Definition of Megaspore
1. [n -S]
Medical Definition of Megaspore
1. Haploid spore produced by a plant sporophyte, that develops into a female gametophyte. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)