noun Botany.

  1. the larger of the two kinds of spores characteristically produced by seed plants and a few fern allies, developing into a female gametophyte.Compare microspore.
  2. the embryo sac of a flowering plant.


  1. Also called: macrospore the larger of the two types of spore produced by some spore-bearing plants, which develops into the female gametophyteCompare microspore (def. 1)
  2. the cell in flowering plants that gives rise to the embryo sac

n.1857, from mega- + spore.

  1. One of the two types of haploid spores produced by a heterosporous plant. Megaspores develop into female gametophytes and are usually larger than microspores.

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