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macrospore (n.)

in botany, "a spore of large size compared with others," 1859, from macro- "large" + spore (n.).

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Definitions of macrospore from WordNet

macrospore (n.)
larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte;
Synonyms: megaspore
From wordnet.princeton.edu