megaspore

mega·spore

noun \ˈmeg-ə-ˌspō(ə)r, -ˌspȯ(ə)r\

Definition of MEGASPORE

1

: a spore in heterosporous plants that gives rise to female gametophytes and is generally larger than a microspore

2

: macrospore

—mega·spor·ic \ˌmeg-ə-ˈspōr-ik, -ˈspȯr-\ adjective