oospore

A thick-walled zygote developed from a fertilized oosphere, especially in an oomycete.

In botany, in cryptogamic plants, the immediate product of the fertilization of the oösphere.

A special kind of spore resulting from the fertilization of an oösphere by antherozoids.

A fertilized oösphere in the ovule of a flowering plant.

A fertilized female zygote, having thick chitinous walls, that develops from a fertilized oosphere in some algae and fungi

a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi