What is "oospore"

Oospore \O"["o]*spore\, n. [Gr. w,'o`n an egg + ? a seed.] (Bot.)

1. A special kind of spore resulting from the fertilization of an o["o]sphere by antherozoids.

2. A fertilized o["o]sphere in the ovule of a flowering plant.

n. (context biology English) A fertilized female zygote, having thick chitinous walls, that develops from a fertilized oosphere in some algae and fungus

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

An oospore is a thick-walled sexual spore that develops from a fertilized oosphere in some algae, fungi, and Oomycetes.

In Oomycetes, oospores can also result from asexual reproduction, by apomixis.