oosphere

noun Biology.

1. an unfertilized egg within an oogonium.

noun

1. a large female gamete produced in the oogonia of algae and fungi

n.

1. A large nonmotile female gamete or egg cell, formed in an oogonium and ready for fertilization.

1. A large nonmotile female gamete formed in an oogonium, such as the eggs formed in the oogonium of an oomycete.