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

o′o·spor′ic (-spôr′ĭk, -spŏr′-) adj.
References in periodicals archive ?
Oospores can play a significant role in infection, and genes controlling resistance to sporangial inoculum can not be assumed to be the same as those that confer resistance to oosporic inoculum (Hash et al.