macrospore macrosporangium • macrosporic · · · Info · Definitions · Synonyms · Characters · · macrospore · · Text Latin · · Script 10 · · Length Definitions · · · (noun) larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte. Synonyms: megaspore. · · Noun Definition 1 Synonyms · · · megaspore · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 m latin small letter m U+006D o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073