Medical term:

megaspore


mac·ro·spore

(mak'rō-spōr),
The larger of two spore types of certain protozoans or fungi.
Synonym(s): megalospore, megaspore
[macro- + G. sporos, seed]
Farlex Partner Medical Dictionary © Farlex 2012

megaspore

or

macrospore

the larger of two types of SPORES produced by many ferns and seed plants. The megaspore gives rise to a female GAMETOPHYTE in ferns and in seed plants, and in flowering plants becomes the EMBRYO SAC. Compare MICROSPORE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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